May I ask what the source on this is? I've heard this before (and for the bronze age), and yet also heard that he and Clark were 25 then. Then there was that weird issue where Clark's classmate was having her 21st birthday, and no way was he that young (but that was later, anyway).Which seems about right to me, because most of the classic writers had their heroes pegged permanently at around 30 years old.
Actual golden age (not Earth 2) references to any heroes ages would be extremely welcome. But I don't think many exist. Guess I could try to figure out Steve's from his rank, but I don't know how promotions worked in the 1940s in wartime.
I admit, Bruce seems a little younger than 29 to me. Partially because he's initially referred to as "young socialite friend" - okay, so that's in comparison to a much older Gordon. But I think anyone explicitly defined as "young" should either be young for what they are described as (doctor, vice president of business, etc.) or be under 27 (non-official beginning of "late 20s" to me). After that, you're just a socialite, not a young socialite. I say this as someone who has 27 far in the rearview mirror. But I will admit, it would have taken him time to train. 25-27 is what I was thinking, but I can't deny the huge amount of later material that undoubtedly influences my viewpoint. I usually think Dick was 12 or 13. 14 is feasible. The kind of undercover gigs he did and his flirtation with a classmate don't suit for a younger age, IMO.