Cost: More like a coffee house price and not a fast food price.
Appropriate Age: Any age, but there are a lot of college students studying and socializing with the free wifi.
I once had bubble tea on a business trip to Taipei, and have been hooked ever since. I was very very excited to discover The Teahouse in the Randall's shopping center at Westheimer and Shepherd!
Check at The Teahouse for the free rewards program (tied to your phone number) and the happy hour deals!