Good footballer, obviously much more of an attacking option if he were to be used as LWB, but he's very versatile. Typical Brazilian technical traits, and a decent turn of pace.
Barza was 30 when he came here, Pirlo 32 and I would say those two were among key players for the past 2 years. I don't look at age as limiting factor. Class is permanent and something ageless. That said I don't want us to be like Milan few years ago but you need experienced players to lead the team otherwise you're just like Arsenal, promising team full of youngsters that hardly win anything.