You realise there are students who are 30, 40, 50 etc? Both at university and who may be returning to study at earlier levels (e.g. to achieve their functional skills maths/English, do an Access to HE course, etc).
I think your attitude to older learners is weird. I don't think older learners themselves are weird and I think they already face enough barriers and judgments in pursuing their intellectual and professional goals through education.
Even beyond that there are plenty of people who may want to use a forum such as this for its careers forums, or because they work in or around education (either within schools or universities) and therefore their experiences may be useful to students in those areas (young or old) and because it's relevant to their day to day work anyway.