In Taipei, you can find a lot of people who practice Chang Chuan styles, plus a lot of Bei Tanglang (Northern Mantis) styles; Baji, etc. Most common, though, it Taiji. Outside of Taipei, different styles of Fujian Crane seemed more common. When I was there, there was a beginning a fad of weird ‘qigong’ among a lot of people who would freak out and act possessed at qigong demos/events, including lots of audience members.
It was not so common for people who practice kung fu to do so much into adulthood, except for Taiji. After university, most quit kung fu to devote their time to their careers and other endeavors.
*Forgot to mention that there’s a good Wing Chun group in Taipei headed by Lo Man-Kam.