You may be interested to know that the University of Luxembourg offers to "Seniors" the possibility of attending some of its courses as an "auditor". Auditors have the right to attend the courses but receive no qualification or certificate. There are no educational qualifications required to enrol as an auditor. Courses are in French or German and the cost is 50€ per semester.
More information can be obtained from
http://wwwfr.uni.lu/universite/actualites/a_la_une/seniorstudium_informationsveranstaltung_am_30_januar
