Spiderman is Marvel, no doubt about it. He's got that classic Marvel charm and his storylines are deeply integrated into the larger Marvel comic universe.
It's hard to give an exact age as it depends on the specific storyline and continuity. But generally, Spiderman was likely in his early to mid-twenties in the 1990 comic.
Sure. Comic Spiderman is well-known for being able to climb walls. It's a crucial part of his superhero abilities that enables him to move freely and fight crime in unique ways.
One way to get the Spiderman Zero comic is to search on popular online comic book platforms. Sometimes, they offer digital or physical copies for purchase. Also, keep an eye on comic conventions or events where vendors might have it available.