No you must get in game on the account you want to change the age on and /changeDOB I think just /help general and it will tell you. then use /age to look what age you are, therefore no way to use your master account to change your age.
$25.000 ?! My age is 94, because for some reason that I really can't remember.
Because today is like the first time I see that my age is 94 and it's totally don't fits my character.
And I don't even have like $25.000 on my bank account.
This, and if you are joining a faction, which will require a /stats SS, just explain OOCly that you are RPing a different age. (I bet I know what you did, you must have said your character was born in 1900, I did the same thing.