Cheers :)
I'm 26. My metabolism is still very fast but sometimes I can feel some mini changes so I guess I still have a few more years. I'll make sure to enjoy it as moderately as possible though, coz I'm certain I'll miss it like crazy once it's gone.
oh yes, you are still in the prime of your stomach being able to handle whatever. I think my consumption was likely at its worst when i was your age and like i said, nothing changed until around 35. You still got a while before you really have to get worried :P