You looke just about where a person with your length of riding experience should be, or a bit better. The first thing that jumps out at me is that you have too much roll in your lower back. You need to get your seatbones pointed straight down and your back straighter, no butt pooches out behind you!
Close your hands around the reins. An open hand does not make for a soft hand, just a weak hand.
Your neck is nicely alinged over your shoulders, which are nicely rolled back without being overly strained.
All in all, doing great. I don't see why you would not compete in dressage now! Around here, the lower levels are full of oldfolks like me (54). But who cares how old the others are, just how well we do.