Cripes, I'm not alone ... and currently 54 so I'm not even unusual.
I bought my Europa new in the early 80's. Rode her on and off until about 6 years ago when I bought a new bike with lots and lots of gears. I felt sad seeing the old girl sitting in the shed not being used and, hearing about this 'fixie' carry on, spent a happy afternoon doing a suicide conversion. Instant addiction. She's been slowly upgraded over the years with track wheels and cranks and modern brakes and aero levers and stuff like that.
She's currently my daily ride which, considering I live in a very hilly area, is rather fun at times (legs my fiance loves, regularly hitting cadences of 150+, etc).
I must like this fixed gear carry on because Paul Hillbrick is currently building me a custom frame with associated parts, which I hope to get before Christmas - it's fixed of course.
That geared bike? It's now in pieces. It's replacement hasn't been ridden in six months and is still filty from its last rainstorm.