decrepit

Synonyms: aged anile antiquated battered bedraggled broken-down creaky crippled dilapidated doddering effete feeble flimsy fragile frail haggard incapacitated infirm insubstantial old quavering ramshackle rickety run-down seedy senile shabby shaking superannuated tacky threadbare tired tottering tumble-down unsound used wasted weak weakly weather-beaten worn worn-out

Antonyms: fit healthy young