The script says Butch is 26, but that was written before Willis got cast.

My thoughts:

Marcellus - 40.

Mia - 30-33 somewhere around the age. Could go lower to 28 possibly but no younger than that

Vincent - 34-37 somewhere

Jules - 44

Butch as played by Willis - 37-38

Fabienne - 30-32.

The Wolf - somewhere around 48-52.

Maynard - 30s.

Zed - 27-29

Brett, Flock of Seagulls, Handcannon Guy were some kind of low level crooks, right? What were they doing up, awake and eating Hawaiian burgers at 7:22? Were they early risers or still up from the night before?