I would collect action figures if they were cheaper.
I do pick up an occasional Thor or Dr. Strange figure, though.
I'm currently into HeroClix. They're cheaper and the smaller size makes them easier to store. I can also use them in board games to give some 'reason' for buying them.
But, yeah, not too old for action figures.
Between the current prices for new figures and the costs for vintage ones, kids either can't afford them or don't really see any value in them anyway. Only an adult would have the resources to build any type of practical collection.