Aged is a related term of conventional.
As adjectives the difference between aged and conventional
is that
aged is while
conventional is pertaining to a convention, as in following generally accepted principles, methods and behaviour.
As a noun conventional is
(finance) a conventional gilt-edged security, a kind of bond paying the holder a fixed cash payment (or coupon) every six months until maturity, at which point the holder receives the final payment and the return of the principal.