Wondering about getting some hot wheels for my 6.5 yo son...is he too old to get much use out of it? Part of what I thought he’d enjoy is setting up new track configurations…he liked doing this with Brio/vtech toot toot but has outgrown them now. Can you do that with hot wheels? Which set/sets would you recommend? Do they connect together? Bit clueless as never actually seen! Thanks