" 

 ::*I'm pretty certain that Birkbeck takes non-mature students (it only offers part-time courses, and it used to [I don't know if it still does] only take students who had a job).  I don't know of any other college that takes only mature students; do you have any other examples in mind? 
 ::Graduate Colleges don't count, of course; the notion of a mature student applies only to undergraduates (the definition used to be that they had to be twenty-five or over; under twenty-five but with full-time jobs counted as Independent students.  Again, I'm not sure of the current regulations).    "