In anticipation of the end of mandatory retirement for tenured professors in 1994 (mandatory retirement ended for other academics in 1986), the author analyzed the demographics of medical school faculty, using 25 years of data taken in mid-1989 from the Faculty Roster of the Association of American Medical Colleges. The annual growth rate of the number of full-time faculty dropped from well over 10% before 1972 to about 1.5% after 1982, while the mean age of the faculty increased from under 42 years to over 45 in 1988. Retirement patterns changed little after the minimum mandatory retirement age was raised in 1982 from 65 to 70 (for tenured professors). Only about 2.5% of all faculty separations in 1984-1987 occurred at or after age 70, and only 5.5% did even in the tenure tracks of the 20 largest private medical schools. Since such a small proportion of openings is created each year by mandatory retirement, uncapping will have little effect on the age or turnover of medical faculty.