Tony meets his younger self

[alex51324.livejournal.com]

I just read this fic (And the tigers come at night) where 15-year-old Tony turns up in the present day (because comic book science), and now I'm jonesing for other takes on this idea.  Are there any?  Younger Tony turning up in the present day or present-day Tony being in the past are both acceptable; I just want to see Tony interacting with his kid!self.  

Variations like other characters interacting with their younger selves or Tony interacting with AU versions of himself are also relevant to my interests.  I don't need any recs for de-aging stories, where other characters interact with young Tony, but adult!Tony is not present--I love those too, but I think I've read them all.

Thanks in advance!