Ma has an earlier generation of three sons in “Once Upon A Dime”, named Butch, Wild Bill, and with the third being unnamed.
These are the first Beagle Boys Scrooge McDuck meets in his travels as a young lad.
So what does this say about Ma and Scrooge’s ages? She’s already gray-haired halfway through his flashback. But one thing is certain, the present generation of Beagles is a huge improvement in the looks department!