Jane Fonda nailed something I’ve been thinking about since retirement. At my 40th college reunion last year, I watched two classmates, both 64 like me, navigate the cocktail hour.
One moved through the room with energy and purpose, engaging everyone he met. The other sat in the corner, complaining about his knees and scrolling through his phone. Same age, completely different life force.
Fonda’s observation that you can be old at 60 or young at 85 isn’t just feel-good rhetoric. It’s backed by decades of psychological research showing that specific behaviors, not birthdays, determine whether we thrive or decline as we age.
The uncomfortable truth is that most people unconsciously choose the behaviors that age them faster, especially after retirement when external structures disappear.
After spending my career in high-pressure negotiations where reading people was survival, I’ve become fascinated by what makes some people seem to get younger while others rapidly deteriorate.
The research is clear: it comes down to eight specific behaviors that either accelerate or reverse how we age psychologically and physically.
1. They feed their curiosity instead of their comfort zone
Most people after 60 narrow their world to what they already know. They read the same authors, eat at the same restaurants, have the same conversations. But those who stay young keep expanding their mental territory.
I started learning about cryptocurrency last year. Not to invest—I’m too conservative for that—but to understand what my nephews are talking about. The learning process itself rewired something in my brain.
Suddenly I was asking questions again, admitting ignorance, getting excited about connections I hadn’t seen before. That mental stretching shows up in how you carry yourself, how your eyes engage, how present you seem in conversations.
The young-at-85 crowd treats their brain like a muscle that needs constant challenge. They take classes, travel to unfamiliar places, engage with ideas that make them uncomfortable. They understand that mental flexibility is what keeps you relevant and interesting, regardless of age.
2. They control what goes on their plate
Here’s what nobody tells you about aging: your relationship with food becomes a proxy for your relationship with mortality.
Fabio Comana, Faculty Instructor at the National Academy of Sports Medicine, puts it bluntly: “Overeating may lead to a shorter life span, cardiovascular disease, and type 2 diabetes, according to the NIH.”
But those who age well don’t just eat less—they eat with intention. They’ve figured out that what worked at 40 doesn’t work at 60. They adjust portion sizes, prioritize protein to maintain muscle mass, and actually pay attention to how food makes them feel an hour later.
I’ve watched too many peers use retirement as permission to stop caring about nutrition. They figure they’ve earned the right to eat whatever they want.
But the ones who stay vibrant understand that food choices directly impact energy levels, mental clarity, and that hard-to-define vitality that makes someone seem decades younger than their chronological age.
3. They choose their mindset about aging
Your beliefs about aging become self-fulfilling prophecies. Becca Levy, Yale Public Health Professor, found that “People with positive views on aging score better on memory and hearing tests, and are less likely to have serious adverse health events.”
Think about that. Your attitude about getting older literally affects whether you can hear well or remember where you put your keys.
The people who stay young at 85 reject the cultural narrative that aging means decline. They don’t deny reality—they know their knees aren’t what they used to be—but they focus on what they’re gaining: wisdom, perspective, freedom from others’ opinions.
I’ve noticed this in my own life. When I catch myself thinking “I’m too old for that,” I usually do it anyway. Not recklessly, but deliberately pushing against the mental boundaries that would otherwise shrink my world.
4. They maintain real friendships, not just acquaintances
After retirement, it’s shockingly easy to let meaningful friendships atrophy. Work friends disappear. Moving to a new place means starting over. Many people settle for surface-level interactions at the gym or grocery store.
But those who thrive prioritize deep connections. They schedule regular calls with old friends, join groups based on interests rather than convenience, and invest emotional energy in relationships that challenge and support them. They understand that isolation ages you faster than almost anything else.
I make myself reach out to one friend every week, even when I don’t feel like it. Sometimes especially when I don’t feel like it. Those connections—where someone really knows you, calls you on your nonsense, shares real struggles—keep you psychologically flexible in ways that no amount of crossword puzzles can match.
5. They stay physically active without making it their identity
The people who age well have cracked the exercise code: consistency over intensity. They’ve found sustainable ways to move that don’t require superhuman motivation or perfect weather.
My daily walks aren’t Instagram-worthy. I’m not training for marathons or posting gym selfies.
But that regular movement—45 minutes every morning, rain or shine—does more for my mental clarity and physical resilience than the sporadic intense workouts I did in my 40s. Movement becomes medicine, not punishment or performance.
6. They embrace structure without becoming rigid
Retirement removes external structure, and many people either become completely unmoored or overly rigid in response. Those who thrive create flexible routines that provide rhythm without becoming prisons.
Research involving over 49,000 adults aged 40 to 80 identified eight pivotal habits linked to longevity, including consuming ample fruit and fish, maintaining an ideal body mass index, engaging in habitual physical exercise, abstaining from smoking, limiting alcohol consumption, and ensuring adequate sleep duration. Notice how many of these require consistent structure to maintain.
7. They invest in sleep like it’s their job
Poor sleep ages you faster than almost anything else, yet many people over 60 treat it as optional. They stay up watching news that agitates them, scroll phones in bed, or pride themselves on needing less sleep.
Those who stay young understand that quality sleep is when your body repairs itself at the cellular level. They protect their sleep environment, maintain consistent bedtimes, and treat good sleep as the foundation for everything else. They’ve learned that one bad night affects the next three days.
8. They keep evolving their identity
The biggest trap after 60 is becoming a caricature of your former self, endlessly retelling the same stories from your glory days. People who stay young keep adding chapters to their story. They develop new interests, take on different roles, surprise people who think they have them figured out.
Since retiring, I’ve discovered parts of myself that career pressures never allowed to surface. The negotiations and power dynamics that defined my work life have been replaced by curiosity about human behavior and the freedom to explore ideas without agenda. This evolution keeps you psychologically supple.
Closing thoughts
Jane Fonda’s quote reminds us that aging is less about the calendar and more about the choices we make daily. These eight behaviors aren’t magic—they’re decisions.
The person who seems old at 60 and the one who radiates energy at 85 are separated not by genetics or luck, but by the accumulation of small, consistent choices.
The practical rule I follow: every morning, ask yourself whether your planned activities for the day are expanding or contracting your world. If too many days lean toward contraction, it’s time to consciously choose expansion, even in small ways.
That choice, repeated over years, determines whether you’re heading toward being old at 60 or young at 85.
