There are many, many stories were the silver haired just saved the day. The reverse isn't true.
I call Bull$hit. There have been many cases recently of elderly Captains dying or incapacitating on board and the younger first officer saves the day.
Don't get me wrong, I mostly agree with you. Experience does provide a bit more caution in how one operates, a caution that is not high on the priorities list when you are younger. But I think that might be more due to age than experience. It might also be due to non-aviation related issues which you experience as you grow older.