My 7-year-old nephew wants to learn how to skateboard. Is it safe for his age? Any tips? Thanks!

Personally, I think skateboarding is a fun and interesting activity. It doesn't seemed that difficult to pick up (the basics I mean, not the stunts). Seven seems like a good age to start. If he is showing interest, buy him a relatively good board for beginner and either sign him up for a class or the easier way would be to learn through youtube videos. Here is a great channel that may help: https://www.youtube.com/playlist?list=PL34F060CE1BA3E968