Alterung
age hardening {of metal/aluminium}
age hardening
age-hardening
ageing
aging
maturation {e.g. of wine/beer/cheese}
maturation
maturing {e.g. of wine/beer/cheese}
maturing
obsolescence
seasoning {timber}
seasoning
senescence {medicine/biology}
super seasoning
thermo-accelerated aging
thermoaccelerated aging
time deteriotation