Originally Posted by
Kaitou D. Kid
I actually think that part of our refusal to deal with a grown-up Peter has to do with our fear of facing the reality that age is just a number.
There are generally two different views of aging:
1. The Traditional View - Life plays like a story with a beginning, middle, and end, and people in life go through different stages at specific ages. They discover themselves in their late teens / early 20's, and then stay that way throughout adulthood.
2. The Modernist / Materialist View - Life is a constant adventure of growth and change, and no one really knows what they're doing. Everyone develops at their own pace, and that's okay because it's ultimately about being better than who you were yesterday. Age is just a number under this worldview.
If the story of Peter Parker doesn't end when he is grown-up and married, and can go on indefinitely, that adds validity to the modern view that age is just a number. And while that can be a freeing way of looking at life, it can also be scary, especially in a world where more and more people aren't buying into the existence of an afterlife. It would mean that aging is therefore unnecessary and kinda a tragedy. Even if Peter doesn't ever physically age past 30, a Peter who stays that young physically while continuing to grow and change as a person is not only enough to remind us of this tragedy, but also to trigger feelings of jealousy in us.
So if you're a fan who buys into the Traditionalist View of aging more than you buy into the modern one (and most of the pro-OMD fans probably do... Notice how one of the most common-listed argument in favor of it was that Peter can't experience significant growth as an adult, or that "the story is over" once Peter marries MJ), the pre-OMD Spider-Man not only challenged a view you had that you maybe weren't ready to have challenged, he also had to rub it in by being fictional and therefore immortal while you, a real person, will grow old and get grey hair and eventually die.