I disagree with this big-time. Older players with high quality and low cost are perfect if you dont buy tokens or dont plan on PT. Sometimes you need a good sub or a player for a certain position and/or you need a few players but dont have the cash or tokens to duke it out over a 5 star player.
Age only means differences in training speed and resale value. It all depends on your situation but dont knock the older players as they are just as good playing as any 18 yo. Of course you want 18-19 yo for fast training and to sell later for good money, but not everyone is able to do that for lack of tokens/money.
All that to say: they make good subs and good main players if you plan on replacing them as soon as you can afford to.