They have had a previous career and experience galore, and they will have no trouble in telling you the story of their life (particularly if you are doing a History degree). They will be amongst the keenest students in the class. Youd be surprised how relatable they can be though... after all you are all in this confusing place together, and nobody really knows what is going on in Freshers Week. While they will not be able to take advantage of all of the social aspects of university, they are bound to be a crucial part of some form of group work at some point during your degree. Its worth remembering that although you there may be quite a sizable age gap, the fact that you are on the same course at the same time gives you the important commonality which is necessary for a friendship. As previously noted, your friendship group following Freshers Week will be incredibly diverse. Making friends with someone who is older than you is an excellent way to broaden your horizons, so dont think of them as better than you because they are older... remember, this isnt secondary school.