What makes the older bikes still desirable these days. Is it like driving a 74 Porshe targa, or are there qualities that can't be imitated by the newer models?
If it weren't for the smaller size frame my son would probably keep riding it. Maybe he should look to trade for something similar but appropriately sized? It's too bad because it is in near perfect condition, barely ridden in its longer life. Any suggestions besides an EBay ad????
Probably your biggest market audience will be on eBay. Take lots of close-up photos of the lugwork, components, decals, drivetrain, etc., and a couple of photos of the overall bike from the drive side. Post as many details as possible about the size of the frame and the components.