Are we getting older later in life? People dread the idea of aging; however, a new study by an international team of researchers revealed that the definition of “old age” is changing. Compared to previous generations, people now put off considering themselves “old” until later in life. The study, conducted by a team of researchers from Germany and the United States and published in the journal Psychology and Aging, analyzed data from over 14,000 people born between 1911 and 1974 who participated in the ongoing German Ageing Survey. Participants were asked a simple question: “At what age would you describe someone as old?”

According to the team’s findings, people in their mid-60s believe “old age” begins around 75. This perception, though, varied significantly across different generations or “birth cohorts.” People born later, especially those born after 1935, tended to push back the age at which they considered someone old. In other words, the threshold for being considered “old” has shifted upwards over time. “Life expectancy has increased, which might contribute to a later perceived onset of old age. Also, some aspects of health have improved over time, so that people of a certain age who were regarded as old in the past may no longer be considered old nowadays,” says study author Dr. Markus Wettstein from Humboldt University in Germany in a media release.

Several factors drive this change in the perspective of “old age.” With people living longer, the goalpost for what’s considered old naturally moves further out. Changes to retirement age could also have an impact. In Germany, the retirement age has gradually increased from 65 and will reach 67 by 2031. If people work longer, it makes sense that they may not consider themselves “old” until later. What piqued researchers’ interest is that they found the trend of delaying old age has accelerated in recent decades but may now be reaching a plateau.

While people born between 1911-1935 and 1936-1951 had very different perceptions of when old age started, there was little difference between the 1936-1951 cohort and those born 1952-1974. They speculate this could be due to a slowdown in life expectancy increases. “The trend toward postponing old age is not linear and might not necessarily continue in the future,” notes Dr. Wettstein. The study also revealed some interesting demographic differences. Women, on average, considered old age to start two-and-a-half years later than men did. This gender gap has gotten even wider in younger generations. People living in former East Germany, who have a lower life expectancy, tended to peg the beginning of old age earlier than their West German counterparts.

Feeling lonely, having more chronic diseases, and worse self-rated health were also linked to considering old age to start sooner. So why does it matter when we consider old age to begin? Our perception can actually have real impacts on health and well-being. Previous studies have shown that people who believe old age starts later tend to have better self-rated health and lower risks of heart disease and other illnesses. Conversely, perceiving the onset of old age as earlier is associated with worse health outcomes.

Researchers caution that if we postpone “old age” too far into the future, it could backfire by making people complacent about preparing for the challenges that come with aging. There may be an optimal middle ground in terms of health and well-being. The findings also underscore how our concepts of aging are shaped not just by individual characteristics but by the social and historical context we live in. As life expectancy has increased and health in later life has generally improved, outdated notions of what it means to be “old” are being revised.