There is no age limit to study at Uni, or to do a PhD. Actually, very often the "mature students" do much better than the young ones.
The problem is not age per se, the problem is that to study you need time and (depending on the country you are in) money. And especially time is hard to come by when you are older.
But don't let age be what stops you from studying, if you want to study.
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Fully agree, it would be great to get study groups together so people can offer each other peer support.
