You’re right, there is no age limit for testing for sexually transmitted infections. Since you are sexually active, STI testing is a great way to take care of your sexual health (and the health of your partners too.)
Research indicates that older adults experience the same conditions for sexually transmitted infections as younger adults, including condomless sex, multiple sexual partners, and low testing rates for older adults.
Feel free to visit Nine Circles for STI testing, or raise the topic of sexual health with your doctor and let them know you’d like to be tested. Some testing locations also have free access to condoms and lube too.