She's vividly awaken with an active mind at 101 yo, it's not a thing for everyone. We try to fix the body decadence problem with technology while ancient seems already discovered it. You can see it in her words and her lifestyle; a simple life, a helpful work, a community that makes you feel appreciated for what you do. All the rest doesn't really matter for longevity.

Btw, the woman is addressing the interviewer using "her", which is a common form of respect, for a person probably half her age.

I think in her case, she kept working, kept interacting with people on a daily basis. A lot of elderly people see mental / physical decline in part due to inactivity, and doing your daily crosswords or brain trainer isn't enough I think.

many people living simple fulfilling lives die much earlier, it's more an exception than the rule (I don't argue that those things doesn't help, just that they alone is not the reason for long healthy life)