I was 44 when I started my degree - trying to get a student discount for anything was a lost cause.
There was one local bus driver who insisted that student fares were only for under-18s. When I tried to point out that uni students were all 18 or over and that I was using a uni bus discount card which was issued by his bus company specifically for uni students, on an approved uni bus route, he refused to let me on the bus. I wasn't rude about it, just confused. But if he ever saw me at the bus stop on my own after that, he just used to drive past me.
I was nearly thrown off a train for travelling on a discounted student ticket, even though I had a valid student railcard and my student ID. I was only saved when the train attendant decided to contact his office to "put me straight"' and they put him straight instead.