Definitions for "Mature student"
A student who is at least 22 and does not fit the traditional profile of someone joining the university straight from high school.
At Kwantlen, a mature student is anyone who is not a secondary school graduate or equivalent but who will be 19 years of age when the semester for which they applied begins.
Student entering higher education at age 21 or above.
Keywords:  course, education, start, higher, over
For higher education - over 21 at the start of the course. For further education - over 19 at the start of the course.