My 17 year old son doesn't know how to tie his shoes. Is there something wrong with him?

or tell time on a clock. he's not a retard or anything, but he's a bit slow, and he doesn't know how to tell time on a clock or tie his own shoes. I have to do it for him every morning. is that weird? should I be concerned?
Update: I can't show him anything on youtubre because he doesn't know how to operate a computer.
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