Ch 12 The Aging Process. Real ailment and senility become inevitable facets of the aging process. the progressive damage of head tissue that is the main factor in dementia in old age-is relatively unusual in noninstitutionalized persons under 75, though it may afiiict as many as half all people over); 85 (Alzheimers organization, 2012). Because… Continue reading Ch 12 The Aging Process. Real ailment and senility become inevitable facets of the aging process.