I have one nephew at 6’10” and another that is 7’1”. They both cope well enough even when challenged with size obstacles. They are young and generally positively motivated which helps.

The back problems will kick in early.

I actually know someone who is that tall and he has a daughter who is tiny. It's really awkward talking to both of them at the same time because he stands at a normal distance which really feels far too close because of how tall he is, but if you step back you feel like you're about half a mile away from his daughter.