Now, I haven't actually seen Iron Man in a comic, but were they to continue with the story that he was originally captured during the Vietnam War, wouldn't that make Tony Stark like at least 60? I mean, most heroes origin stories aren't really linked to anything that could be considered an actual historical milestone, so you can sort of just let your imaginition fly, and the ones that are (like Captain America) usually have some sort of reason for why they aren't a senior citizen yet. I know, suspended ageing would be far from the least realistic thing in these books, but perhaps that has some effect on why they did it?
That said, I've been reading up more and more on comics lately on the internet, and is it just me or are there a ton more 'events' then there used to be? Like, I remember being a kid and, say, DC would have like one big crossover a year, but now it seems in a perpetual state of crossovers. One stops, the next starts.