You never reached your potential
Aging sucks. It lowers your potential. Physically and cognitively, your maximum possible ability slowly declines over time. Its not something most people look forward to.
But here is the good news. Unless you're an olympic athelete and chess grandmaster at the same time, you are nowhere near your potential and you probably never were.
The gap between actual capacity and current performance is enormous for the vast majority of people, at any age. They don't exercise enough, don't challenge their brains and don't sleep enough. So even as aging chips away at the theoretical maximum, the distance between where people are and what they could do stays wide for a long time.
A 2026 Yale study published in Geriatrics tracked more than 11,000 people aged 65 and older for up to 12 years. 45% showed measurable improvement in cognitive function, physical function, or both. About 32% got cognitively better. About 28% improved in walking speed, which doctors use as a reliable proxy for overall health and mortality risk.
These were not sick people rebounding. A significant portion started with normal function and improved anyway.
The reason this isn't common knowledge is that research looks at group averages, and averages show decline. Your results may vary. Researcher Becca Levy at the Yale School of Public Health put it plainly: "If you average everyone together, you see decline. But when you look at individual trajectories, you uncover a very different story."
The study theorized that mindset predicted outcomes. Participants who held more positive beliefs about aging at the start were significantly more likely to improve on both measures, even after controlling for age, education, existing disease, and depression.
The cultural story you absorb about aging becomes biological. That is the theory, and the data supports it.
Your potential is getting lower, but the good news is, you never reached your potential. You still have a lot of improving to look forward to as you age, both cognitively and physically, if you put in some effort.