With the medical advancement, I see so many people around us who live in their 80s and 90s. If we take care of our health, we can see ourselves living to 100 years.
IMO, a good financial planning can take care of most scenarios. The other small chance will be taken care of by family and friends.
I beleive a good hearted person will not worry about it. All the good thing he/she done will help him/her in the late life stage. I have seen so many examples around me.