I have to agree. Your age should not be a problem at all.
I too think it may be more of an instructor issue. Some instructors are the nicest people in the world, but aren't very good at getting the necessary information across to their students.
I had a number of instructors in my training. Looking back I think I was very lucky that my principal instructor was excellent at getting the required info across to me, in a way that I easily understood.
I had a number of other instructors, that I didn't learn anything from. My PPL could have taken a very long time if it was done mainly with one of them. Some of these instructors were the nicest of people, and some of the other students really liked their methods......but they just didn't teach in a way that I learnt.
Try a different instructor/school. Much better than giving up. There is no reason why you shouldn't be able to attain a PPL.
dp