Just looking at the past three years there is a more obvious shift towards younger players, but we also increased the size of the squad. Now we have the jabronis as back up rather than U23 players, probably for experience.
2021-22
Tek, Perin, Pinsoglio, MDL, Rugani, Bonucci, Chiellini, AS, MDS, Pellegrini, Danilo, Cuadrado, Arthur, Locatelli, Bentancur, Rabiot, McD, Ramsey, Chiesa, Kulu, Berna, Dybala, Morata, Kean, KJ
Average age: 26.68 (25 players)
2020-21
Tek, Buffon, Pinsoglio, MDL, Demiral, Bonucci, Chiellini, AS, Frabotta, Danilo, Cuadrado, Arthur, Bentancur, Rabiot, McD, Ramsey, Chiesa, Kulu, Berna, Dybala, Morata, CR7
Average: 27.27 (22)
2019-20
Tek, Buffon, Pinsoglio, MDL, Demiral, Bonucci, Rugani, Chiellini, AS, Danilo, Cuads, Pjanic, Can, Bentancur, Ramsey, Rabiot, Matuidi, Khedira, DC, Berna, Dybala, CR7
Average: 29.3 (22)
Obviously losing Buffon and CR7 makes a big difference but it's far from the only one.