FEDIVERSE NEWS ALERT
I really hate the whole concept of body language. It's just basically you unconsciously expressing yourself and even then, it doesn't paint an accurate picture of what you are truly thinking or feeling. Some people are oblivious to it while others are extremely sensitive to it.
When I was a kid, I got in trouble multiple times for "displaying inappropriate body language to teachers" and I never knew what I did wrong.
If you read about most people who make it past 100 (centennials) you'll fine people who just eat fish and chips or who don't exercise other than walking or short bike rides or who smoke. Meanwhile most marathon runners don't make it to 80 (heavy intake and burn of energy reduces your lifespan a bit).
Living to 100 is probably pure genetic lottery. There's nothing you can do to get you there, and there probably aren't a lot of them because there's zero evolutionary pressure that benefits humans for living that long.