After consulting with the coding gurus, I must unfortunately inform you that it is quite unlikely to happen. As it stands, there is no function to set the age of a character through the API, such function is a requirement to be able to the creation of an @command feature that would allow to adjust a character age.
There is a simple workaround for you though. The actual age of a char has no impact on the game and cannot be seen by others. However, on a voluntary basis, you can simply state the age your character, or an idea of it, in your char's description and edit it as needed (@description command).
I apologize if my hasty words gave you a false glimmer of hope.