Conversation so far:
How old was Lionel Barrymore when Lionel Barrymore started acting on stage?
age of 15.
What was the name of the play he was in?
The Rivals.
Did he perform with any relatives like his parents who were actors?
He proved his talent in such plays as Peter Ibbetson (1917) (with brother John).

Question: Did he like acting?
Self-contained rewrite: Did Lionel Barrymore like acting?