My grandma is 90 and still lives alone, walks around her neighborhood daily, and swims in a community pool outside her back door. She attributes it (I think rightfully) to a lot of walking and activity throughout her life.

Probably some good genes too (her brother is 100, her sister just passed at 104)

Aging is such an interesting topic that I find myself thinking about it almost every day but more of from the scientific point of view, like what is going wrong and why is the rate of aging so different in the animal kingdom. There are mammals that can live super long compared to ones in the same species and even same sizes, like some birds I remember 50+ while other do less than 10 years. Then there's something like naked molerat etc, the greenland whale hundreds of years lifespan..

Even between people, like Queen Elizabeth lived relatively long and her mother I think also, if you look at pictures throughout her life she always looked younger than her age IMO. And when she died it was very quick not like drawn out years that many have to endure, many long lived people actually pass very quickly..

If I wasn't in software dev, I think I would be in this field.

https://www.youtube.com/watch?v=aixnlVbmzE8

nah it's not probably. it is certainly is a big role