If you are a person who tends to learn and gather wisdom, then you will still have plenty to learn after 100, and you will be wiser at 200.

I read recently that in the US the average life expectancy is 86 for women and 83 for men, and it has consisitently gone up about 3 months every year for decades (maybe even most of the last century --- it's a solid trend). So in about 60 years, the average life expectancey will be about 100. Even now, with the average life expectancy in the mid 80's, it means there a lot of people who live beyond their 80's. It's becoming very commonplace for people to live very long lives.