formula used to work but it doesn't anymore ... get the "Parse Error at char(0): Invalid Type in operator >.(Expression #1)
IF [Year Built] <= "1969" THEN "0000 - 1969"
ELSEIF
[Year Built]> "1969" && [Year Built] <= "1979" THEN "1970 - 1979"
elseif
[Year Built]> "1979" && [Year Built]<="1999" then "1980 - 1999"
elseif
[Year Built]>"1999" && [Year Built]<="2010" then "2000 - 2010"
elseif
[Year Built]>"2010" && [Year Built]<="2020" then "2011 - 2019"
ELSE ">=2020" ENDIF