I have been receiving an interesting newsletter for some time now, which you may care to subscribe to.  It is called "Positive Aging", and you can sign up for it here

I particularly enjoyed this edition, from which I have excerpted the following:

ELDER ACCOMPLISHMENTS

Counteracting the prevailing cultural bias that creativity
is the provenance of the young, many periodicals now mention
the great accomplishments achieved by those 60 and over.
Here is a sample of some of the achievements of older people
we have recently discovered:
*Sophocles wrote Oedipus Rex at 70 and Electra at 90.
*Michaelangelo began work on St. Peter's Basilica in Rome at 70.
*"Grandma Moses" took up painting as a hobby at 76.
*Laura Ingalls Wilder, author of Little House on the
Prairie, published her first book at 65.
*Benjamin Franklin helped write the Declaration of
Independence at 70 and was named CEO of Pennsylvania at 79.
*Mother Teresa continued her missionary work until her death at 87.
*Arthur Rubinstein gave one of his greatest piano
performances at New York's Carnegie Hall at 89.
*Golda Meir was named prime minister of Israel at 71 and
held that office for 5 years.
*Mahatma Gandhi led India's opposition to British rule at 77.
*Frank Lloyd Wright completed New York's Guggenheim Museum at 89.