If its possibly damaged, then replace it. If there is no concern, then don't replace it. Pretty simple.

My 9yo was out riding with me today and her road bike has a full carbon fork thats 12 years old. I dont think teice about her using it as it was in good condition when we got the bike a handful of years ago and has been handled well ever since.
0 desire to change a fork that is giving me no reason to want to change it.