Stamp Collecting.

When I was a kid I was nuts about it. Now I collect '78's...lol

I collected stamps as a kid. I got back into it for a little while in my early 30s, and may again when we're back in the States permanently.

I guess my biggest concern about stamp collecting is that they're made of paper, and no matter how good of care you take care of them, sooner or later they'll just fall apart.