If I remember correctly. Bach had about 20 children and he dedicated a lot of his time to their education. A few became very successful musicians. It is an example than later in life a lot of our value is not so much on doing, but helping form the new generations.

Ravel wrote his most famous work, Bolero, after age 50, and suffered a traumatic head injury a few years later. Not a good example, except perhaps that the odds of bad things happening increase with longevity.