I bought an ICE Sprint this Fall, not because I was older or looking for comfort or finding my other bikes difficult to ride. I bought it because I had too much time to browse the internet while recuperating from a fractured wrist this summer and, because I had seen a number of very neat bents on the local rails to trails, I just had to join the club. I do have to say that 1) I have not seen any bent riders younger than mid 40s, 2) the folks that want to chat about my trike generally have some grey hair, and 3) I have learned to not bring up in casual conversations at work that I bought a tricycle. Although on the other side, I went on a ride with a coworker in his 30s and we switched rides because he wanted to try the trike - had a hard time getting him to switch back. Also, pre-teen boys seem to be very impressed.
The biggest slam was when I was passed by a gentleman on a 2 wheel bent. He probably had 15 years on me. We chatted for a while and then he said," Always wanted a trike, but I am not old enough for one yet!"