Carlo's last game as manager of PSG was the same day as Moyes last game in charge here. It has been awhile.
I'm trying to think of players even close to 35 who haven't dropped off a fair bit. All I've got is Milner. I think it is more of a risk than you're suggesting.
And for me Brands signs the players. If Moshiri is letting Carlo go over Brands and do stuff then Brands should just leave. No point in having a DOF who doesn't get to do his job. The idea of the manager making some signings and Brands making some needs to go though.
Honestly I feel like you are moaning for moanings sake here although I get what you are saying there are reasons to be optimistic about the prospect.
Of course the manager is going to have a say on a player he knows. He will have links to him, more than likely still keeps in touch with him and will know where is up to in terms of if he can still perfom. This is one of the best managers on earth we are talking about here. Its one player and he would more than likely come in and be his captain for a year or two.
The risk is lessened purely from what I have just said there. It's not a blind signing.
Age is used far too much these days as a reason not to sign players. If you are good enough you are young enough etc.
Zlatan was a success for United, even our very own Phil Jagielka was of a decent standard until his last year here when he was what, 35? And he wasn't as good as Silva was. Sheringham and Giggs went up to their 40s. Holebas of Watford is 35 and I think he still plays well too.
We also still have two pretty young cenre backs in Mina (always struggling to stay fit) and Holgate, Keane is still an England international (somehow) and
Branthwaite is coming through. A player like Silva is ideal to bridge that gap whilst
Branthwaite develops more whilst still being able to offer experience and leadership (which we do lack) to the first team.
We can still sign other players.