Green’s Dictionary of Slang

(US black) an old person.

1944		‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.
1958		Hughes & Bontemps Book of Negro Folklore 482: creaker: An aged person. I hate to see a creaker act so chippyfied.
1960, 1975		Wentworth & Flexner DAS.
1994		P. Baker Blood Posse 3: The old creakers had slipped back into their apartments.