I was born when this movie came out, so I saw it much later. Some times even now in my twenties I take out that film and watch it. The movie is very simple; it is about good and evil, adventure and misfortune. The whole romanticism with being a hero, a true hero. It is an absolute escape from the reality, but that is what it supposed to be.
Even now when we go camping with my friends we always sing the memorable songs from this movie.
The silliest and most ironic part about the movie is the duet between de'Treville and d'Artagnan, where de'Treville sings, "How old are you my child?" and d'Artagnan (Boyarski with huge mustache and is about 30-35) answers back, "I am 18 years old!" That is the greatest silliness.