Alvaro Morata is an experienced player who is still young and can make an important contribution by teaching tricks and tactics to younger players in order to create a long-lasting and experienced team that can compete in Serie A, and that's what they are doing.
Nobody says no, but he's obviously starting to get old too. You understand that to play in today's football you have to be in good shape otherwise you is simply out of the market. There's nothing wrong with that obviously, but if you want to be at the top you have to sign young players.