>>149873561
Yeah his age has varied over the years. In 1970 there was a Brave and the Bold issue that depicted Earth One Bruce Wayne helping out Sgt Rock during World War 2. This would have put him in his 40s.

>>149194135
In The Brave and the Bold Earth One Bruce Wayne helped out Sgt Rock in Europe when he was young, the editor had to clarify that he was in his early 20s back then.