Wishing to really know myself as old, I subjected myself upon my retirement to the examination and tests of some half dozen medical experts for eyes, ears, heart, lungs, digestive tract, kidneys, and even sex, but was surprised to find how hard it was to do so. A strong minority of my impulses preferred the ignorance that is often bliss. There are no mental tests of generally recognized validity above the teens, so that we have no criteria for determining psychological age for even the elderly, while psychoanalysts refuse on the express authority of Freud to take on patients over forty. When it was well over I was glad, for most organs and functions were found to be in fair condition, although one was in need of some special care. I realized anew, however, that there are no gerontologists, as there are experts for women, children, etc., and that barring acute attacks I must henceforth, for the most part, be my own physician and that I must give far more attention than ever before to keeping well and in condition. Body-keeping for the old is a very personal and pressing problem requiring much time and attention, and the methods that are successful differ so widely that the diet and regimen good for one might be dangerous, if not fatal, for another. But my chief interest for months centered in rather voracious medical and psychiatric literature upon senility and its disorders till my friends thought me in danger of growing morbid and predicted and feared hypochondria. Gruesome and depressing as it all was, it had nevertheless a certain grim fascination to know what a cohort of disorders encamp about and prey upon the aged, any group of which is liable to assail and perhaps take the citadel of life by storm. Evasion of these enemies gives a new sense of heroism.