Being single in your teens might not have much effect on your happiness, but new research suggests the picture can change as you get older. A large study involving 17,390 young adults in Germany and the UK has uncovered a pattern linking prolonged singlehood with declining life satisfaction and increasing loneliness throughout young adulthood. The differences were relatively small during adolescence, but they became more noticeable as participants moved through their twenties.
Researchers tracked participants from their mid-teens into their late twenties to understand how romantic relationships influenced their psychological well-being over time. The findings suggest that people who remained consistently single experienced greater increases in loneliness and steeper declines in life satisfaction than those who eventually entered their first romantic relationships. The results raise questions about the emotional challenges some young adults face when they spend years without a romantic partner, although they do not mean that everyone who stays single will experience declining mental health.
Researchers Found That Well-Being Changes With Age
Published in the Journal of Personality and Social Psychology in 2026, the research examined data from 17,390 young adults who had never been in a romantic relationship at the beginning of the study. Researchers used information collected annually from participants in Germany and the UK, following their experiences between adolescence and the age of 29. This approach allowed the team to examine how life satisfaction, loneliness and depressive symptoms changed as participants grew older and some entered their first romantic partnerships.
The results showed that teenagers who remained single initially had relatively similar levels of well-being to those who later found partners. However, the pattern began to change during emerging adulthood, when participants faced new responsibilities and experienced changes in their social lives. People who remained consistently single reported increasingly difficult well-being trajectories compared with those who eventually entered relationships, particularly in terms of loneliness and satisfaction with life.
Researchers described the overall risks associated with prolonged singlehood as moderate, meaning the findings do not suggest that being single automatically causes serious psychological problems. Instead, the data revealed a consistent association between remaining single for longer and experiencing less favourable changes in certain aspects of well-being. Individual circumstances still matter, and the experiences of one person may differ considerably from those of another.
Loneliness Became More Pronounced During Young Adulthood
One of the clearest patterns involved loneliness, which increased more among people who remained single throughout the study. While the differences between the groups were relatively small during adolescence, the gap became more noticeable as participants progressed through their twenties. The research suggests that the emotional experience of prolonged singlehood can change over time, particularly for people who want a romantic relationship but have not yet found one.
Life satisfaction followed a similar pattern, with consistently single participants experiencing larger declines than those who eventually entered relationships. Satisfaction with life reflects how people evaluate their circumstances and their overall happiness, rather than measuring a single emotion or difficult day. When this satisfaction declines over several years, it may indicate that a person’s broader experience of life is becoming less fulfilling, although the research cannot identify the precise reasons behind every individual’s experience.
The findings do not establish an exact age when being single begins to damage mental health. Instead, they show that differences in well-being become more pronounced across emerging adulthood. Some people may experience loneliness much earlier, while others remain content with single life well into their thirties and beyond. The important distinction is between simply being single and experiencing prolonged loneliness or dissatisfaction while wanting a different kind of connection.
Depression Followed a Different Pattern From Loneliness
The researchers also examined depressive symptoms, and the results differed from those involving loneliness and life satisfaction. Differences in depressive symptoms became more pronounced later in young adulthood, rather than following exactly the same pattern observed in loneliness. This suggests that emotional disconnection, dissatisfaction with life and depressive symptoms should not be treated as interchangeable experiences, even when they occur together.
Loneliness describes the feeling that a person lacks the meaningful connection they want, while depressive symptoms can involve a wider range of emotional and psychological difficulties. Someone may feel lonely without experiencing depression, just as someone in a romantic relationship may struggle with depression despite having a partner. The study’s findings therefore offer a more detailed picture of well-being than a simple comparison between single people and couples would provide.
The researchers also found that entering a first romantic relationship was associated with improvements in life satisfaction and reductions in loneliness, but the same pattern did not appear for depressive symptoms. This distinction is important because it suggests that a new relationship may improve certain parts of a person’s emotional life without automatically resolving broader mental health difficulties. Romantic connection can be valuable, but it cannot guarantee that every psychological struggle will disappear.
Finding a First Partner Was Linked to Lasting Benefits
Participants who entered their first romantic relationships experienced higher life satisfaction and lower loneliness, with these associations continuing beyond the immediate period when the relationship began. The findings suggest that a first partnership can coincide with meaningful improvements in how young adults evaluate their lives and experience social connection. For people who have spent years hoping for a relationship, having a partner may bring companionship and a stronger sense of belonging.
However, the results do not prove that finding a partner is the only reason well-being improves. Entering a relationship can coincide with changes in social activities, daily routines and the amount of emotional support someone receives. These factors may contribute to the changes researchers observed, while personal circumstances may influence both the likelihood of finding a partner and a person’s overall happiness.
The study also indicates that lower well-being can be associated with remaining single for longer. This creates the possibility of a cycle in which loneliness and dissatisfaction coincide with difficulties forming a romantic relationship, followed by further declines in well-being over time. That pattern does not mean lonely people are destined to remain single, but it suggests that emotional difficulties and relationship formation can influence one another in complicated ways.
Six Important Findings From the Research
The results offer several insights into how romantic relationships and psychological well-being may be connected during young adulthood. Although the findings describe average patterns across a large group, they cannot predict the experiences of every individual.
- Teenage years showed smaller differences: Participants who remained single initially had relatively similar well-being trajectories to those who eventually entered relationships.
- Loneliness increased over time: Consistently single young adults experienced greater increases in loneliness as they progressed through emerging adulthood.
- Life satisfaction declined: Participants who remained single experienced larger declines in satisfaction with life than those who later found partners.
- Depressive symptoms differed later: The gap in depressive symptoms became more pronounced in the later stages of young adulthood.
- First relationships were associated with improvements: Participants experienced higher life satisfaction and lower loneliness after entering their first romantic partnerships.
- Individual experiences still varied: The study identified average patterns rather than a universal rule about when singlehood becomes emotionally difficult.
These findings challenge the assumption that relationship status has no connection to well-being, but they also show why broad claims about single people can be misleading. The researchers identified moderate risks associated with prolonged singlehood, rather than evidence that being without a partner inevitably leads to poor mental health.
Why Staying Single Does Not Mean Being Unhappy
The research has several limitations that should be considered before applying its findings to everyday life. Participants came from Germany and the UK, so the results may not reflect the experiences of young adults in countries where family expectations, dating traditions and attitudes towards marriage differ. The study also focused on people who had never been in a romantic relationship when the research began, meaning the results should not automatically be applied to people who have experienced previous relationships or chosen to remain single after a breakup.
Another important consideration is that an association does not establish that singlehood itself caused every change in well-being. Personal circumstances, existing emotional difficulties and social connections may influence both relationship formation and life satisfaction. Some people may also choose single life because it suits their priorities, while others may want a relationship but struggle to find a compatible partner. Those experiences can look similar from the outside, yet they may have very different emotional consequences.
Being single can be a fulfilling choice, and the research does not suggest that everyone needs a romantic partner to live a happy life. Friendships, supportive family relationships and meaningful social activities can also provide connection and belonging. The findings are most relevant to understanding the potential difficulties associated with prolonged singlehood, particularly when it coincides with loneliness and declining satisfaction with life.
The Real Issue Is Whether People Feel Connected
The research offers a closer look at the relationship between romantic partnerships and well-being during a formative period of life. Entering a first relationship was associated with improvements in life satisfaction and loneliness, while people who remained consistently single experienced less favourable changes in these areas. However, the findings do not establish that everyone should seek a partner by a particular age or that relationships provide a guaranteed route to happiness.
For someone who feels isolated, the more useful question is whether they have the emotional support and meaningful connections they need. A romantic relationship may provide that connection, but close friendships and supportive communities can also help people feel less alone.
