I went back when I was in my 50's! But I mostly took online, Open U. courses (here in the United States) and through a university that mostly had older students. That's what I would try if I were you; see if that university had some online courses to take one or two and see if that is what you want to be doing (and you could still look for jobs as you could do your school work whenever) and that way you would not have to worry about the age of the other students or if anyone thought you were stalking your acquaintance, etc.:

http://www.open.edu.au/public/home