Mmm... I'd lick him like he's made of chocolate. Okay, I'm pretty sure that'd be inappropriate even if this wasn't a cartoon. I've been rewatching Korra and, I don't know why, I can easily see Korra and Iroh getting together. And I'm pretty sure Asami is an Equalist, or a trainee.
To think that Dante Basco's probably just as old, if not OLDER than Iroh Jr., yet a bunch of people are going to feel like they're still hearing a teenager's voice because of all the adolescent characters he voiced. Poor guy.
Well, I don't recall this being explained directly in the show (if it was then I too missed it), but the information can be found on the Avatar Wiki here: [link] . If you do not believe the Wiki, I have been told that you may also find this information on the official Korra Nick website. I'm assuming said info would be found within the "Welcome to Republic City" interactive game. Hope that helps!