You need a blend of youth and experience, especially when you are refreshing a squad.
You don't go full out Liverpool and drop off because everyone is going into their 30s.
You need some young players that are 20-23 like a Saka, a Mainoo, a Garnacho age profile.
Then you need a spine of experience to guide the youth, when the 20-23 players are 25-26 the older players are getting less minutes, and eventually replaced.
By the time the Mainoos and Garnachos are 30, you have a new batch of 20-23 players who have a high ceiling.
United did that with players like Keane making way for Carrick, players like Stam had left for Rio and Vida. We had Rooney, Ronaldo as our youngsters, guided by older heads who set the standards.
Bruno being 29 is not a problem, he can set the standard.