Just because you're not old now doesn't mean you're not old enough to become culturally obsolete. Kids and adults both were tickled by the zany pace, the shiny look and the ingenious gimmick of what toys do when their owners aren't looking. But adults seemed to identify with the toys a lot more than younger viewers did.
Kids are possessive of toys, sure.
Adults, though, are sentimental about them, and that isn't remotely the same thing. It's no major leap from there to getting left behind yourself. That's a pretty depressing way to describe one of the funniest movies in recent memory. But if the Toy Story sequel manages to construct even wilder gags, and to stretch even further the idea of the secret life of toys, it also leaves an even more bittersweet aftertaste. At its most heart-wrenching, this chipper cartoon is also a parent's stricken fantasy of being outgrown.