Brewer's: To Age as accords
To do what is fit and right (Scotch law term). Here “Age” is from the Latin agere, to do.
“To set about the matter in a regular manner, or, as he termed it ... to “age as accords.””
—Sir W. Scott: Redgauntlet, chap. 2.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894