cuaiztac.

Headword: 
cuaiztac.
Principal English Translation: 

gray hair (see Molina); a gray-haired or white-haired person or white-haired people (quaiztaque, plural)

Orthographic Variants: 
quaiztac
Alonso de Molina: 

quaiztac. cano dela cabeza.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 84r. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

in vevetque, in jlamatque, in tzonjztaque, in quaiztaque = the old men, the old women, the white-haired ones, the white-headed ones (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 191.