Anointed were generally supposed to be dedicated, baptised (and anointed) before 1935, not just born before 1935. I think Jack Barr was the last serving GB member to meet this strict qualification: he was born in 1913, baptised in 1934, and died in 2010.
I wonder who was the first GB member who was baptised after 1935? Possibly Raymond Franz, baptised 1939, and appointed in 1971. I think the rest of the the 1971 GB were baptised before 1935. (Although I have not checked)
Of the 1974 intake, Ted Jaracz was baptised after 1935, maybe others too, and increasingly after that.