The problem is, while the average person would say "hey, that was thirty years ago, probably not the same." But, then again, look at what we pointed out to George W. Bush when he was being elected. We brought up crap from thirties years before in an attempt to point out why he would be a "horrible" choice. I'm thinking about the drinking, but even though it was three DECADES later, someone still dredged it up.
I wouldn't be surprised when we have another bout of something like McCartism (sp) going through the country and thinks you say ten, twenty, thirty years before will suddenly doom your life.
I'm big on getting things to forget. I remember an article about a woman who was registered as a sex offender in her 20's (probably with sex with a minor) and now she has to move because the local church started up a child care within 1,000 feet of her house. It was twenty years ago, but since we can remember, we choose to remember. And, as you said, everyone does something stupid in their life, but how do you get away from it if someone keeps bringing it up?