In terms of writing, I don't believe that age limits... anything at all.
We watched a bumble bee fly out to sea and I asked him to explain how the bumble bee flies and he cracked a joke.
I will never throw away those letters, even though the senders are now in their forties and would laugh hysterically if I were to show them an excerpt.
While experience provides a wealth of stories to be mined, there is definitely a place for the brave, the idealistic... the clear, strong voice of people who have not, in any way, become hesitant.
In 1994, aged twenty-three, I stood in front of several hundred delegates in a hotel in South Kensington, and tried not to pee myself.