Christersson studied 508 adults in N.Y. age was correlated with supragingival plaque but less related than gender, race or presence of periodontitis. No correlated with subgingival calculus. 1986 study of Sheiham, et al. Revisited a group of English factory workers 14 years after initial exam and found peridental index scores better because of improved O.H. National health and Nutrition Exam survey, age was a less important determinant of perio status in the elderly than was O.H. NIDR analysis of an 1981 survey, deep pockets were no more extensive in people over 65 than in middle-aged groups. Discussion Page stated that periodontitis in most elderly is slowly progressing, begins in early adulthood and progresses slowly.
Individual susceptibility is more important than the age effects.
Age alone in not a major factor in severe periodontitis. S.D of LPA measurements is about 0.8 mm. So LPA change needs to be at least 2 mm to be significant rather than error. But this level of LPA is so common. Therefor 2-mm level of LPA as a threshold for 'disease' not fruitful.