One of my pet peeves is families who ride together, with the children all in helmets but the parents without them. I feel like I could shake the adult and ask "who will care for your child when you're brain dead?" In addition, what kind of example is the parent setting for their chld?

Regarding replacement, when it goes out of style, replace it! Seriously, at three yeares of service, a helmet has suffered sun damage, sweat damage, and has probably been bumped around in your car or your closet. It's worth $50 or so to keep yourself safe!

BTW, don't store your helmet in your car if you ever park outside in the sun. The extreme temps in your car will cause the foam to degrade, compromising the quality/safety of your helmet.