I am a few years older. The long-term efficacy of the MMR vaccine i probably received in childhood was later questioned.
So i signed up for another one last autumn. Partly due to the recent explosion of US measles cases and partly out of concern that the current administration might decide to ban the vaccine altogether.
Told the pharmacist i didn't know what MMR i originally received. He said it didn't matter because by this point i would need a booster regardless.