How old do you consider Peter parker to be in current Spider-man comics (616)?
I was just having a conversation elsewhere about the various clones of Gwen and I mentioned that she's always brought back the age she died (17-19) but Pete keeps getting older and Gwen never seems to comment on this. It should go without saying but from Peter's side, outside of the original saga, it has never appeared he's seeing her as anything other than a friend so it's not creepy on him.
But other people gave various ages from 20 to 30, so I was wondering how everyone here sees him.
Personally, I see him as 25.
Similarly to Dick Grayson (the original Robin) he's a guy who was there at the start and has aged/matured along with the comic book universe. He's now in his early prime, highly experienced and seen as a peer among the current heroes who appeared around the same time, but still full of potential and young enough to lead the next generation to even greater heights.