overage

nouns

a surplus or excess of money or merchandise that is actually on hand and that exceeds expectations
overage
is a type of (narrower)
anything of material value or usefulness that is owned by a person or company
assets

adjectives

too old to be useful
"He left the house...for the support of twelve superannuated wool carders"- Anthony Trollope
over-the-hill, overage, overaged, superannuated