He just turned 6 this August. I'd say he's possibly doing the same thing as your 2yr old, testing me to see what he can get away with. In the beginning I had to practically beg him to pick his feet up at all but he's been getting better and better with giving it the first time I ask. And tonight he was ready to lift his hind leg for me right away. I had just put the front right foot down and as soon as he saw me going for the back I saw him shift his weight and he picked up 1st try.
I guess his previous owner was very much a beginner and didn't have any real experience with horses (not that i'm an expert by any means!) She boarded him at the farm I got him from and would go months at a time between visits. I guess before she decided to give him to the farm it had been 4 months
since she even went to see him!! I couldn't believe it, I can barely make it 2 days without at least going out and giving him a treat or something.
So I'm hoping with more practice and handling he'll get better at it. If it continues I'll have to have a vet come check him out
Hopefully it won't come to that though!