At least where I live, Tetanus is one of many "required" immunizations if you are going to school or participating in some sort of childcare system. If you home-school, you are not technically required to vaccinate.

I remember getting boosters and if I'm not mistaken for adults the recommendation is every 10 years, though I could be wrong.

I got a booster before going on a mission trip to a 3rd-world country, though Tetanus was one of the _many_ vaccinations we got.