Some folks last better than others
Agreed, but as you implicitly suggested, lifestyle makes a difference.
During a memorable visit to a nursing home, I had the pleasure of dining with my grandmother (who lived to age 98) and my aunt (my grandfather's sister, who passed away a couple of months later at the age of 99). There was a spry old man at another table who had been a dancer in his youth, and he was enjoying his 100th birthday. They lived in a rural Texas community where just about everyone worked hard and ate a "traditional" breakfast. My aunt said she knew she would get old someday, but she didn't realize how "old" she would feel. No one ever worked harder on a daily basis than she did, but carrying around heavy feed bags took its toll, and she suffered from constant aches and pains when she reached her 90s. She told me, quite seriously, that she wished she was my age. (I was 50 at the time.)
One of the aides offered the old man a dance to celebrate his reputation as a dancer, so he stood up and they danced right next to the dining table for a few minutes. She asked him if he wanted to sit back down, but he didn't want to stop. He received a round of applause. I approached him after dinner to wish him a happy birthday, and I asked him, "When you were 50, if someone had told you that you'd be dancing on your 100th birthday, would you have believed it?" He smiled and replied, "Would you?"