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.
The story of Hologram Spiderman in the comic is full of excitement. Spiderman has to battle against villains who can manipulate holograms to create chaos. He also has to figure out how to counter these new threats and protect the city. It's a wild ride for our friendly neighborhood hero.