Hmm. 5 year old boys - I have a 6yo and a 4yo. Ninja Turtle stuff is good. We have lots of hot wheel cars, Star Wars stuff like light sabers, the bigger chunky Legos, and for some reason they really like to spin stuff like a top. I steer clear of toys with smaller parts since we have the smaller one. SO be sure to keep that in mind if there are younger siblings with choking hazards.