Why don't musical audiences seem to have a reaction?

I’ve been spending a lot of time lately attending live music performances in small venues. Some are local bands, others are regional or national bands that play smaller venues. Usually I’m the oldest person in the audience by 20 years. I’m also usually the only idiot up dancing and getting into the music. Am I missing something here? Is it weird to have a reaction to music and want to dance? Most people sit politely still, no expression, no tapping feet, polite clapping at the end of a song. (By venue, I mean bars, or music halls without seats. Places that serve beer.)

Is it weird for a band to play for an audience that doesn’t react to music? Am I just showing my age?