Right now there are nearly 2 million people in the USA who are in their 90s and it is projected that by 2050 three will be 9 million of us over 90.
Many "seniors" are already worried about outliving their incomes and adding more years to their lives may add more expenses but not necessarily more income.
Living into one's 90's or 100's is no longer the stuff of legends
Will you just grow old?
Or grow older better by:
Taking supplements [but make sure they are not made from rocks and petroleum]
Hanging out with friends on your computer
Continuing to work [by finding a new career] – even if you don't need the money