Anyone can get any sort of diabetes at any age. I did a quick literature search, and I found one paper describing a newly diagnosed T1 who was 94 (this paper claimed that the previous oldest known case was 93). At diagnosis a T1 is typically under 30 (often a lot under 30) and thin, whereas a typical T2 is over 40 and overweight. However, these are stereotypes and there are lots and lots of exceptions. Thin people or young people can still get T2, and old or overweight people can get T1. To make life even more complicated there are also quite a number of other, rarer, forms of diabetes than the usual T1 and T2. This is all good reason to see a specialist if you are in doubt about your diagnosis.