Yeah, I have beers that I drink right away, and others that need (or that I want) to age. I'm not sure how old the oldest ones are, I'm doing a good job of pretending they're not there.
that last part is the key, pretending they're not there or having the willpower not to drink them even when you know they're available can be a b****. but if you've got the willpower, it can be incredibly rewarding. though I've got a few of my homebrews cellaring, most of my aged collection are commercial beers....... mostly barleywines, RIS, and belgians of a variety of styles. I've got a few that date to the late 80's, but most are significantly younger from babies to 10-12 years old.
when I first started dating my wife, she found my beer closet and had moments of wondering if she'd gotten involved with an alcoholic. I'm trying to build my stash, but it's difficult - space, money, limited willpower. I'll never get to be like my friend Jim Ritchhart, though I'd really like too!! He's got cases of beer, some going back to the 60's-70's, possibly a few significantly older than that.
luckily, he's willing to share. we've did a vertical tasting of Thomas Hardy going back to the first examples in the mid-60's, 1965 was the first I think. That was truly an amazing afternoon.