I'm Birmingham City, and I signed both Beckham and Ronaldo. I personally have no problem signing players over the age of 30. There is a cut off point for me though. Over the age of 33/34 I tend to avoid sign.
My vote goes to Henrik Larsson. I've always been a fan of him as a player, and when he started for Celtic he had great hair. Although I am kind of biased as well because I pick Celtic over Rangers any day, and I'm a Utd fan.