I'm on the low end of 4-7 years. I think it was about 2003 when I started seriously drinking tea. For me seriously means when I went over to loose leaf and started paying attention to brewing parameters, etc. I'd always enjoyed the occasional cup of tea (prior to going loose leaf, Bigeolow's Plantation Mint was my favorite). I decided to order and try some loose tea (more as a result of loving online shopping than any tea-o-philia, but I was hooked. At that point I was drinking strictly flavored black tea. This is also when I discovered that I prefer my black teas with milk. Better brewing, better leaf, and milk made all the difference, and I started drinking MUCH more tea. From there I started branching out- first into white teas, then green, and recently oolongs. I like them all. Flavored, unflavored, you name it. I think I'm kind of an oddball in that I genuinely like both flavored and unflavored tea. I love to relax with a cup of tea in the evening- I simply can't relax properly without one. When I sit on my couch at night and enjoy my tea all the stress of the day melts away. It's fabulous stuff. I've actually been reading this board on and off for some time- but never posted before today.
And right now, I'm enjoying a cup of Upton's Mellow Spice Blend.