Reading everyone else's replies, feel I should just note down 'mustn't grumble' and leave it at that, but as a fully-accredited self-important windbag...
I'm 72 (and a half). Quit tobacco (never much of a fan), boozing (to any extent - current UK 'safe' guideline is 14 'units' a week - I do maybe five or six a year) and haircuts in the 1980s: have been health-conscious about food since my 20s (without always putting my knowledge into practice), and a vegetarian since 2015, when I met my new partner, who has been one since she was at school. Never learned to drive (or ride a bike), and have been at least partially responsible for various dogs for the last 35 years, so always walked a lot, and I can still run (when there's a purpose to it - never ran for the hell of it), jump, climb (hills or stairs, never rocks or trees), and fall without doing much damage (being a football goalie and a long-term haven't-given-it-up-but-running-out-of-partners Frisbee freestyler really helps). I had a health check last year, blood pressure low to normal for my age, cholesterol (I take statins) and liver function normal. I'm officially overweight, with a BMI of around 27-28, but that's been the case most of my adult life, and it was a lot worse in my 40s. It fluctuates. And I had a bout of norovirus in 2014, but since then, not even a cold, at least, not that I noticed.
On the limited downside, just the the usual diminishing of sight, hearing and short-term memory (although not all of that is necessarily down to age
), and vascular problems with my hands, which can sometimes be patriotically striped red, white (Raynaud's pheomenon) and blue (well, purple), and often fail to function completely when cold and wet - which, as I'm a gardener, they often are. But, really, mustn't grumble.
I've been extraordinarily lucky with my physical health, but, despite appearances, I'm not remotely smug about it. Many friends, relatives and acquaintances in my age cohort have had bouts with cancer, broken bones, arthritis, pneumonia, high blood pressure, heart arrhythmias, angina, pericarditis, diabetes, depression, scleroderma, early onset dementia, and so on – several are long dead – and I'm well aware of how that luck can change in a heartbeat. I'm also forever on the lookout for early signs of dementia, having seen my mother live with it for 15 years.