By the late 80's, the Rock genre had been through many different changes, branching off to a variety of sub-genres such as Folk Rock, Psychedelic Rock and Glam Rock. Therefore it had quite a broad audience which we see as 18 and Life made it to #4 on the billboard 100 chart. However I think it would be fair to say most fans of 18 and Life would have been teenagers and young adults. This is partly because of this matches the age of the characters used in the original video. Adolescents like finding role models as it gives them someone to look up to. The band members of Skid Row will attract an audience slightly younger than themselves as the audience will feel they can relate to the stars and will enjoy asspiring to the rock stars who represent the "Star Image". I dont think the song is gender specific, particularly as it has a glam rock feel which is quite popular amongst both genders.