Ok. Let him sign the players you mentioned and play together for 3 years, they will still be about 30 and will have build enough coherence then.
I really don't know what are you targeting. You asked if we can trust Mourinho with money based on his football. The only reason people are slaughtering him for playing pragmatic football is the quality we have which ironically he's the only reason for us to have them due to his signings and how he spent his money. Also, he had spent money on players that can be there for years like Bailly, Lukaku and Pogba. It feels quite ironic to say we can't trust Mourinho with money whole the the only reason we have a good team that we want to play better football. We were shoehorning Rooney in middield when we got Mourinho ffs.
Your point was that he shouldn't be trusted with money because he plays shite football, which is completely irrelevant to the topic. After that you went on shifting goal posts to other directions like age and stuff
Mourinho left a very good squad for all his teams in the future bar Inter. His first Chelsea side finished runner up in league and CL after he left, Madrid dominated Europe and Chelsea walked the league after him. The only time he left an aging squad was Inter because he was signed for the sole purpose of winning them CL quickly while here he keeps talking about taking it slow and that we're in transition.