Most Helpful Guys
Well... Although a five year are gap isn't bad... Your current she and his might make things difficult. 21-26ish he'll be exploring, testing, failing, etc at life. In that, work, travel, friends, etc will likely be doing things that until you're 21 you won't be able to be a part of (i. e. trips to Vegas, local favorite bar/club, things that are for "adults" only, etc). I think you should keep in touch but wait... Just my thoughts
Most Helpful Girl
don't do it. There's so many people out there. It's not worth risking him getting charged and there's a massive maturity gap between a 17 and 22 year old.