I went back for a master's at about 30 (and ended up with a second bachelor's as well) and while it was challenging to manage everything, the school work actually felt easier. I think I just had 1) better study habits and 2) a real sense of WHY I was back in school which made it feel easier than it did at 18-22. I was no where near the oldest in my classes either. I felt quite 'average' in terms of age, actually.

My husband did the same thing - got his masters at 37, I think (maybe 38) and felt the same way. Now I'm back in the university setting all the time and I'm tempted to go back once more!

Personally, I think you get more out of your education as an adult with more world-experience than you do as a traditional aged student. Of course, had you told me that at 22, I would have said that was bull-poop.