advanced age, advanced years, age of retirement, an incurable disease, anility, caducity, debility, decline of life, declining years, decrepitude, dotage, eld, elderliness, feebleness, green old age, hale old age, hoary age, infirm old age, infirmity, infirmity of age, longevity, old age, pensionable age, ricketiness, ripe old age, second childhood, senectitude, senility, senior citizenship, superannuation, the downward slope, the golden years, vale of years, white hairs