Nedved, Cannavaro, Thuram, Barzagli, Pirlo, Tevez. Most of our best signings of different eras happening in the ages of 29-31. Then ask the Galactico real madrid how old their new stars were (zizou, figo, makelele, Ronaldo etc).
But in todays youth obbsessed team building (its smart to do it, but dont be singularly focused on it), anyone above 26 is considered basically almost finished why even bother lol