One way could be to contact the developers and ask if they have any plans to bring it back or if they can provide a way for you to access it. Another option is to search on various gaming forums to see if other users have found a workaround.
Well, it's hard to give a specific age. The comics have gone through many reboots and alternate universes. But generally, Spiderman is often shown as being in his twenties or thirties at various points.
First, do some research to know which story arcs or series of old Spiderman comics are highly recommended. Then, try borrowing from libraries that have a comic section or join comic enthusiast forums to get tips on where to find them. Sometimes, estate sales or garage sales can surprise you with old comic finds too!
You might try looking for an option in the settings or preferences section of the Neopets website. Sometimes, there's a way to manage or remove old comics from there.
One option is to donate them to your local library or a charity. It's a great way to give them a new life and help others enjoy them. Another possibility is to have a garage sale and see if comic book enthusiasts in your neighborhood are interested.