Is anyone over the age of 30 (I’m 31) and not had the genetic testing/Down syndrome testing done?

Is it something that has to be completed?

Have 2 children. Both without any genetic issues. Baby #3 is the same dad. Due to my age with my first 2 (21 and 23) and low family risk they said it wasn’t something that was classed as high risk and were told we only had to if we wanted to?

Thanks :)