The person born in 1943 actually had far more in common ( especially back in the '60s-'70s ) with those born in the 1930s, than with those born in 1948,'49, '50.
It is usually accepted that a generation spams 25 years; though the "WAR BABIES" ( 1942-'45 ) are an exception and should probably be classified as a substrata of the previous generation.
Most of those who faced the draft and fought in Vietnam were born 1943-1953 (more from 1943-45 than from 1951-53). The earliest boomers, 1946-50, were the peak. 1948 was the birth year that had the most men in Vietnam and the most casualties.
I was born in 1953. (Monday is my birthday, btw, turning 58.) I had a draft number, #2, but I also had a deferment, since I was preparing for church ministry. And very few from my birth year, 1953, actually went to Vietnam. The war was winding down by that point in the early '70s.