In my opinion it is actually easier to learn as you grow old.
Wherever I have observed the younger a person is, the lesser is his power of concentration, the more impatient he is and the more "living in illusion" he is.
All this means, you would not expect a younger person to actually sit down and practice meticulously, also you would expect him to get frustrated with the slow progress. Since he would be living under an illusion that he is great and everything in life comes easy - I am sure he would stop putting efforts very soon (as soon as he feels that he is not getting results).
Remember the child prodigies that you see were either obsessively interested in their particular field (and their brains + body was actually wired suitably for it) OR they were driven into it by their parents who didn't allow them anything else in life.
You donít get what you deserve, you get what you negotiate.