There are people of all ages and backgrounds who come to university, there will definitely be people your age on your course, and likely people who are older too. I know it can be difficult, but instead of worrying you should simply be proud of the fact that you got onto the course that you wanted and believe in yourself to be successful. 23 is honestly not an old age to be starting university and you will find people by the on your course or those you live with, are those in societies or you just meet along the way that you will get on with and become your friends.
No one will judge you for starting university at 23 instead of 18 I promise you. If you think you need support from your university in terms of academics or mental wellbeing then please to access this, your university will have support.
To discover what support your university can offer you, you can check their website under ‘support services’. you can also attend an open day (clearing open days should be coming up soon - and these are not only for people who went through clearing) and talk to the support services team at one of their stands or attend support talks.
I hope this helps you feel more at ease, and please let me know if you need advice on anything else.
- Rosie