Well Messi and Hazard arn't going to want us right now. Any player coming here is going to be well aware we are not going to be competing for bigger trophies for at least 3 years. So you are elite player who is 27+ that next move you make is likely going to be your last big move, the players worth anything are going to want to take that move to go to a club where they want to compete.
The players who come here that age plus are going to be doing it because either they arn't quite good enough to make it at a top club, or we are throwing stupid money at them, paying massively above the odds a tactic which isnt sustainable, (something we are seeing already with Sanchez deal), or are already in decline.
Plus the the whole bring in a player so he can teach the younger players something is ridiculous, firstly that's why you have coaches, if the coaches arn't good enough to do that you need better coaches. Secondly the Idea of spending 80-100 million on some one who is going to be regression by the time your team is ready to compete again, just so some of there ability may rub off on the younger players is just bonkers! Plus normally turns out to be nonsense, people made this argument about how Sanchez's ability would rub off on Martial, I suppose you could argue his attitude has certainly got worse. They also made the argument when Ibra came in that he would rub of on Rashford, and thiers no question Rashords form dipped that year.
Right now big money signings of aging players just doesn't make sense to us. If you are one piece away from competing and you need that bit of experience in a certain area to propel you on. You don't do it when most of your squad needs a overhaul.