Just an observation, the rim is under compression when the tire is inflated, so the edges of the seam are being pressed together, not pulled apart. So, I think that the chances of sudden disintegration are slim. But for peace of mind have it inspected hands-on, preferably by de-mounting the tire, tube and rim tape, and making a thorough inspection of the interior to check for cracking, etc. If your son has the thick Velox cloth type of rim tape, substituting Continental Easy Tape, Kapton tape or filament-reinforced packing tape would make tire mounting easier.