Where were you meeting all these Naas people? I live in Naas and have to say it's very difficult to meet Naas people here. Almost everyone is a commuter from elsewhere. That's probably one of the best things about Naas - thousands of young people from every corner of the country and every corner of Europe.
I agree with those who highlighted the huge number of high quality bars and restaurants - I can think of no town outside of the city that offers more in terms of night life.
There are also a lot of very successful social and sporting clubs including musical and dramatic societies, GAA, soccer, athletics, several gyms/spas, martial arts, scouts, art, golf clubs and societies, tennis, rugby, etc.
Naas is also well known for boutique shopping and horse racing and this may serve to highlight the affluent perception of the town.
The truth is that there is a great mix of people with a noticeable concentration of young people enjoying the lifestyle that Naas offers.