At what age is infidelity most common?

When Is Infidelity Most Common?

It's a question that often surfaces in conversations about relationships: at what age are people most likely to stray? While love and commitment can last a lifetime, studies suggest a pattern when it comes to infidelity—one that shifts with age and life stage.

Back in the 1990s, research pointed to men in their 50s as the group with the highest rate of infidelity. This was often linked to what some call the "midlife reflection"—a time when career goals are assessed, youth is fading, and emotional vulnerabilities may surface. But by the 2000s, the peak had shifted. Men in their 60s became the most likely to engage in unfaithful behavior.

Why the change? Some experts believe it’s tied to evolving social norms, longer life expectancy, and later retirement. As people stay healthier and more socially active into their later years, opportunities—and temptations—may increase. Also, shifting dynamics in long-term marriages, such as emotional distance or unmet needs, can contribute to decisions that stray from commitment.

It’s important to note that these trends don’t define everyone in those age groups—many people remain faithful through decades of marriage. But the data does suggest that the 60s, rather than the 50s, may now represent a more vulnerable period for infidelity, at least among men. While less studied, female infidelity patterns appear to be on a different trajectory, often peaking earlier and tied more closely to emotional dissatisfaction.

Ultimately, infidelity is less about age and more about context—emotional connection, communication, and life transitions all play a role. As relationships evolve, so do the challenges they face—especially when life enters its later chapters.