What age are people happiest? Research says it’s probably not what you think.

Would you go back to being 9, where your biggest worries were times tables and playground drama? Or maybe your early 20s, filled with endless possibilities, late-night adventures, and no back pain?

While pop culture tends to glorify youth, a recent survey found that people’s favorite age isn’t childhood or early adulthood. It’s 36.

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Many people say their 30s are when life starts to click.Representative photo by Canva

As surprising as that may sound, developmental psychologist I think it actually makes perfect sense.

The surprisingly joyful “crunch years”

For the last four years, I've been studying people in their 30s and early 40s. My colleagues and I even coined a new term for this often-overlooked life stage: established adulthood — defined as ages 30 to 45.

It’s a time packed with major milestones: building careers, starting (or ending) marriages, raising kids, buying homes, or deciding not to follow any of those paths. It’s also when people start juggling demanding work responsibilities with caregiving for children, partners, or aging parents — what my colleagues and I call “the career and care crunch.”

At first, I expected to hear mostly stories of stress. But as we gathered data from hundreds of interviews and surveys, something unexpected emerged.

Yes, people were busy and overwhelmed. But they were also happy.

Stress and satisfaction often go hand in hand in your 30s.Representative photo via Canva

“I feel very solidly happy in this space right now,” said Yuying, 44. Nina, 39, described herself as “wildly happy.”

All names were changed to preserve participant anonymity, but the themes were strikingly consistent.

“I’ve put together a machine that finally works”

Many people reported feeling like their lives were finally clicking into place. After years of working on their careers, relationships, and personal growth, they felt confident and accomplished.

Mark, 36, said, “I’ve put together a machine that’s finally got all the parts it needs.”

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Jodie, also 36, shared that she had finally figured out what really mattered. “You don’t waste a bunch of time going on half a dozen dates with someone who’s not going to work out,” she said. “Your friend circle becomes a lot closer because you weed out the people that bring drama.”

Even the physical signs of aging didn’t seem to dampen the joy. Lisa, 37, said, “If I could go back physically but had to go back emotionally and mentally? No way. I’d take flabby skin lines every day.”

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It’s not ideal for everyone

It’s important to note that not everyone experiences this phase the same way.

The original research largely focused on middle-class North Americans, many of whom were white. For people navigating systemic barriers — whether financial, racial, or otherwise — the “best years” might look very different.

And while the early 2020s were defined by a global pandemic that intensified pressure on parents and caregivers, many people are now navigating a post-pandemic world with more clarity about their priorities. For some, this reset has reaffirmed the value of their 30s — a time when they gained emotional strength, resilience, and purpose.

Rather than a decade of stress, many now view their 30s as a period of growth, hard-won insight, and, surprisingly, happiness.

age and happiness, 30s life, established adulthood, emotional maturity, parenting and career, midlife joy, life satisfaction, adult friendshipswww.youtube.com

The sweet spot worth paying attention to

That so many people would choose their 30s as their ideal age suggests this life stage deserves more attention.

Books like But You’re Still So Young by Kayleen Schaefer are helping to highlight the stories of people building careers, navigating relationships, and confronting big life questions in this decade.

But You’re Still So Young by Kayleen SchaeferAmazon

My colleagues and I hope that our work and Shaefer's book are just the beginning. A better understanding of the challenges and rewards of established adulthood will give society more tools to support people during that period, ensuring that this golden age provides not only memories that we will fondly look back upon but also a solid foundation for the rest of our lives.

Clare Mehta is an Associate Professor of Psychology, Emmanuel College. This article originally appeared six years ago on The Conversation. You can read it here.