If you find yourself wanting to be at the rink at every waking moment to practice, then you are NOT TOO OLD.
You need the right combinations: perseverance, determination, and passion, you will need those especially when you are having an off day. Those days do appear at times. That is when you will go home angry, and frustrated, because you were doing fine and all of a sudden there is a glitch.
However, the next day, you lace your skates up and back for more. SO NO ONE IS EVER TOO OLD FOR ANYTHING, especially if you have determination, desire, and passion.
The sense of achievement will give a tremendous boost to your ego. The main thing is to enjoy your moments on the ice. After all that is why you are there isn't it? I always believe that if you are doing something that you are truly enjoying then you are going to want to improve your skills to get the most out of it.