1. [adj]  old; no longer in use or valid or fashionable; "obsolete words"; "an obsolete locomotive"; "outdated equipment"; "superannuated laws"; "out-of-date ideas"
2. [adj]  too old to be useful; "He left the house...for the support of twelve superannuated wool carders"- Anthony Trollope
3. [adj]  discharged as too old for use or work; especially with a pension; "a superannuated civil servant"

SUPERANNUATED is a 13 letter word that starts with S.