I just looked at my Smallpox vaccination card. My first one was in 1961 which was two doses a few weeks apart.See... I thought it was a one time thing... done shortly after birth.
I guess that proves that you are older than I am!
I think the vaccine was ended in 65? 70??
Then I was vaccinated for smallpox (boosters I suppose) in 1965, 1968, 1972 and 1979.
The World Health Organization declared smallpox eradicated in nature in 1980.
I guess I am feeling pretty good I won't die of smallpox.