What are the joys of life after 50? What do we live for?

In your 10s, it's the fun of hanging out with friends, playing games, and going to school
In your 20s, it's drinking and hanging out with the opposite sex
In your 30s, it's marriage, children, and enjoying economic activities
In your 40s, it's finding more relaxed pleasures
Then, for those in their 50s and 60s, when health declines, parents pass away, and various other problems arise, what kind of fun is there to live for?