@bschillace
I suspect I agree with the point you're trying to make, but ...
... is Attebourough really a good example of this? He was host of most of the Zoo Quest serieses in mid 1950s to early 1960, and then he was involved in BBC administration for a number of ears, all before Life On Earth. Also, he started life with a ton of privileges. What worked out for him probably wouldn't for most people.
@bschillace I think of Grandma Moses often when I think of age and creativity. She didn't start painting until in her late 70s.
In Hawaiian culture they referred to women seers as haka, but they didn't believe they could truly be haka until after they stopped bleeding. Goddess knows one can think about so many more things when one isn't worried about pregnancy or menstrual cycle, or anemic from blood loss, or fatigued from chasing children and addressing their needs.