Thank you for your reply, everyone. So I did some search as well and got the following:
Ed Maxwell: In May 1990 he became a 747 captain with UPS at 25
James T.Boyish: at age 19, became B777 captain, Neverland Airlines
(Sure it is not in US as you have to be 23 to hold an ATP, right?)
Anyway, we concluded that someone is BSing about being CA at DAL at 24.
Thanks again!