Shallow learning in the form of a quick, correct grasp of almost anything new (and interesting) is easier to me now than 25 years ago because of good foundational skills and broad industrial experience. On the other hand, deep focus on something alien for a long and sustained period is a no go: I have not the time, not the patience, not the need to find my place in life at this stage, so I can just take what helps me directly and move on.