There is a minimum age but I can't remember if it's 9 or 10. Want to say 9 since that would have been the age my dd was when we did the ride.
As for the ride itself...very gentle, nose to tail, unless you get a horse like mine who decided the surrounding vegetation was a buffet for him!!! Good think I had him and not my dh or dd!!! He was one of the last horses to be used..wonder if it was because of his 'eating' habits. But, he was really fun and I got to 'ride' more than most...meaning I got to have some control over where we went. We did ride out just before a huge torrential downpour that came along with a thunder storm. I had just finished asking the ride asst. what happens if it starts to thunder/lightening while we're out there in the woods, on these strange horses. She said they had checked with the weather radar people just before we left and it was fine...and that the horses didn't really mind it, but that I should be glad it wasn't raining since my particular horse (Mr. tree muncher) hated getting wet!! Well, you can probably guess what happened at that moment....huge crash of thunder, and the downpour started. We rode for about 5 or so more minutes until we got to a spot wide enough to turn the horses around in. We had already been on the ride for about 30 minutes. It was just hysterical seeing all those people (about 9) trying to turn their horses back to where they had just come from. Thank heaven I had ridden before (about 30 yrs. before!) so knew how to turn my poor horse and then dd and dh's horses followed me. We were the last three in line. The asst was really right about my horse not liking to be wet...he kept trying to pick up the pace, but that's a little hard to do when you're horse number 10 in a line of 12!!! But, he kept trying to pass the horses in front of him!! Asst told me she was really glad I was on him and not one of the front people who were, at this point, really freaking out in the storm. By the time we got back to the stable, my feet were soaked, I looked like a drowned rat. We were told to go to the kennel area and we would be given towels so dry off with. Then, we were told that we were being refunded all our money!!! How cool was that? We had been out on the trail for almost an hour and had a ball and it was free!!!! there were some people that really griped about the rain and the bad ride...it is one of my family's favorite memories!!!
I would definately wear long pants and sneakers at least. Sandals would not work. They do give you a helmet. We had a ball even though it is a really gentle ride.