At uni full time now at 41 (doing MSc in Outdoor Education) and going again next year to do a PGDE – so 2 years full time in total. Difficulties – money obviously. Slight feeling of being of an older generation. Pros – opening eyes to a whole new world – almost literally. Meeting people from around the world and getting a real change of scene. I would recommend it but eyes need to be wide open obviously. Happy to speak further or meet if you’re in Edinburgh area – email in profile.
As to other students having a hate of you ^^^ – haven’t seen any of that – depends on attitudes and people you’re with. If you’re studying at Masters level then you’ll find everyone is there to learn and the work is too hard to fanny about. If you’re back at undergrad level then ymmv.