This is a pun on the phrase 'act your age' which means behave in a manner appropriate to someone of one's age and not to someone much younger, but 'wage' which means a fixed regular payment, typically paid on a daily or weekly basis, made by an employer to an employee, especially to a manual or unskilled worker, is used in it's place because it sounds similar to 'age' and because having a steady wage may help you get out of debt
To stay out of debt , act your wage .