Anyone who has unprotected sex can catch a STI. Left untreated, most STIs cause serious health problems but symptoms can be hard to spot. So, the sooner you get tested and know for sure, the better.
Getting a test for STIs is a responsible thing to do and can often end needless worry. Most STIs can be treated effectively with antibiotics and the earlier this is done the better. You may feel embarrassed going to get an STI test, but really there is no need. Staff at the clinics or at your GP surgery will be happy to help and wont judge you. You can get an STI test at any age, young or old.