These people are fools and should be labelled such! Myself, aged 19, and many of my young male peers enjoy a good G&T! In fact, I have a bottle of Tanqueray and a bottle of Hendrick's Gin on my desk, just waiting for their tonic partners.
Just make sure you use aforementioned gins, or Gordon's or Bombay Sapphire. Anything less isn't worth your time.