See
http://www.militarian.com/threads/gr...-auction.5339/
he was "57 in 1944" so he was born around 1887
Bernard, who was shot down off Denmark in 1940, died in 1971 aged 84. = 1887
"Bernard Green was born in Bourne End, Buckinghamshire on 23rd December 1887."
Can't get any more accurate than that...