If I want to express the idea of "a man begin to learn scuba diving" using the word "student", can I write as follows?
He became a student of scuba diving at an old age.
thanks for your help!
It sounds rather strange. We don't "study scuba diving", we "learn to scuba dive". I would not try to frame it in terms of being a student.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.