坐禪三昧經 2.84

2.84

生因緣老死。云何老？齒落、髮白、多皺、根熟、根破、氣噎，身僂拄杖行步，陰身朽故，是名老。

Birth conditions aging and death. What is aging? Loss of teeth, whitening of hair, many wrinkles, faculties ripening, faculties decaying, shortness of breath, stooping of the body, walking leaning on a staff, and the decay of the aggregate-body; this is called aging.