If you see Enzo Maresca (44) as not a young and dynamic manager then I understand. 
But I think he shouldn't be considered as an old manager where Xabi Alonso (42) is also considered as a young manager.
I see managers at the age of over 50 as old ones. For example Conte (54) would have been like that if Chelsea contacted him. Anyways, Fabrizio Romano has already announced the agreement between Chelsea and Enzo Maresca. I'm excitedly waiting for what is going to happen. He has an experience as an assistant manager at Manchester City as well. He must have learned some good things from Guardiola. Making Leicester win the Championship is a start already.
But I think he shouldn't be considered as an old manager where Xabi Alonso (42) is also considered as a young manager.I see managers at the age of over 50 as old ones. For example Conte (54) would have been like that if Chelsea contacted him. Anyways, Fabrizio Romano has already announced the agreement between Chelsea and Enzo Maresca. I'm excitedly waiting for what is going to happen. He has an experience as an assistant manager at Manchester City as well. He must have learned some good things from Guardiola. Making Leicester win the Championship is a start already.
I have noticed a trend that now coaches who have ever worked with Guardiola are highly valued (Kompany - Bayern, Maresca - Chelsea), and if the first one is quite young and has not yet proven his skills with impressive results, then Maresca was able to win the Championship, which looks very earnestly. He is already discussing summer transfers with the management, for now it is reported that he wants to buy a goalkeeper and a defender.
In respect to the decision of Chelsea as a club, accepting Maresca as the coach, hope he does better than the former or his stay won't be quite long. With the stay of Pochettino, Chelsea are supposedly to win the Conference league and go far in the Premier League, considering they took Maresca as a better replacement we expect him to win the trophies and send Chelsea back to the Champions league. A lot is on him, he should do what seems right for him, whatever quality of players he needs to help him succeed in his regime.