Please do a search on this topic within Wannabes - it has been covered probably more times than anything except 'which school'. Use 'age' or 'too old' as the search words and then set aside a day or two to read through all the threads you will find.
As a clue, Capt Pprune (Danny Fyne) was in his late thirties when he started. He now flies B737s.
Scroggs