Oh boy. My 8 yo son can’t tie his shoelaces. He wears cowboy boots or shoes that either have velcro or are already tied (he slips his feet in). OTOH, he knows his Roman numerals.
My seven year old is still learning how to tie his shoes, and I think I’ve figured out why! The laces they sell with kids shoes are way too short. They look fine in the store, but once you take them out and re-lace them properly, through all the holes, there’s only three inches left to tie into a knot. You have to buy longer laces to give the kid something to work with.
My son (6) can’t tie his shoes - he likes Crocs and other shoes for easy slip on and slip off. But he is homeschooled and can ice skate and can tell you about the Cold war.