I find that there are two kinds of people who stage door:
The first kind are people of any age who appreciate the talents of the actors and would like them to sign their Playbills out of respect and having a piece of history; possibly also a picture.
The second kind are kids, generally under 20, who think that by wearing pink they will become Laura Bell Bundy's BFF; or that by telling Jonathan Groff that they love him, they will become engaged.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle