Well the title pretty much sums up my question. Marvel have always tried to keep Spider-man accessible to all ages and i'm guessing one of the reasons he doesn't have any children in the current 616verse is probably for that exact reason. Its not that it hasn't been considered. Heck it even happened back in the 90's but the baby ended up still-born (or taken by Osborn. I still don't understand wtf happened there) there's even an entire series dedicated to Spider-man and Mary Jane's daughter and the horrific arc called Sin's Past (where Gwen Stacy's character was completely butchered) originally had the twins Gabriel and Sarah as Peter's children not Norman's but at the last minute the guys at Marvel decided that having kids would age Spider-man too much so instead we got the horror that was Sins Past.
Sins Past was not the first time Marvel had considered hooking 616 Spider-man up with a child either. A while back a story was pitched to Marvel by Bill Mantlo about the possibility of having Black Cat become pregnant with the web-slingers child. This like the others was dropped as Jim Shooter thought it would age Peter to much not to mention having a child out of wedlock "apparently" might send the wrong message (personally I don't see a problem with it).
Of course now Spider-man has a side-kick in the form of Alpha (I don't bet much on that lasting long) so he is beginning to break the barrier as he is now a mentor to a young hero. so I pitch the question to you.
Would having a child in the 616verse age Spider-man too much? Or would it simply add more to his character?