I'm 18, turning 19 in November.
I don't think that age matters with tamas so much. Some people just seem to like them very much, others just don't get these at all. My boyfriend understands why I have my tamas and doesn't question my hobby. (We are living together.) My mother in the other hand likes to tease me about them everytime I'm visiting my parents and have one tama with me. Most of my friends don't know about my tamas. One of them knows thought and she is really intrested but doesn't have any by herself.
I have to admit that when I'm in places where is other people I tend to keep my tamas safely in my bag. But I still keep them with me, I like carrying one or two of them. At the moment I have three of them running. V1, V3 and V5.