Most people stop learning after graduating from school since learning is a requirement only for school. Learning is a lifelong pursuit. A requirement for a long career in the technical fields.
I read someplace that after college 40% (or maybe it was 60%) said they were never going to read a book again.
Kind of reminds me of the old conservatives who say they haven't changed their minds in 40 years, which to me means they haven't learned anything new in 40 years.