Big time. Salah, Henderson, Milner, Fabinho, Alisson (even though he's probably fine for another 10 year!), Matip, Thiago, Firminho, Van Dijk and probably others I forget, all 30+ and none of them have really been replaced
That's the problem with success. It focusses on the short term. You focus on winning and the trophies that brings. That's what's happened at Liverpool. "Oh we'll get another year out of them" etc. Until you end up with and over the hill squad with a smattering of glorified youth players chucked in. It grates to say it but Ferguson mastered refreshing squads at Man Utd.