Back in the mid to late eighties, I had an issue trying to check into hotels when I was 18-21, especially if I was on a road trip. There was one time that I was sent to a hotel by my Franchisee in Boca Raton for training purposes. They were refusing to let me stay because I was 19. I had to get the Corporate Area Manager involved before they finally let me stay. I found this to be a pain because later that year I was promoted to Store Manager at 19 yrs. old. I was mature beyond my age and wasn't the type to trash things, but all they saw was my age.
I had not finished all my training and was sent to Oakbrook, IL for my 2 weeks of final training. Ironically, I met a future boss who was going through her training to be a Franchisee, even though she didn't remember when I interviewed 6 years later. This training had the hotel on site and was used by trainees and corporate people who had to visit HQ. So no problems there.