Originally Posted by
bat39
I'm guessing he's going by the Earth 2 Bruce Wayne's birth year, which was established as being 1915, which would make him 25 in 1940 when he meets Dick.
In terms of the actual Golden Age comics, the first flashback of Batman's origin, in 'Tec # 33, stated that the Wayne murders happened ''some 15 years ago'', and that comic was published in late 1939. That would mean that Bruce was born in 1914, or maybe even early 1915...so it all more or less fits.
Dick's age on the other hand was never really hinted at in the actual Golden Age. I think its Earth 2 which at some point gives him a birth year of 1928, making him 12 when he becomes Robin.