“Nail Growth: 30 Years of Observation”, 1974-09 (; backlinks):
Secular trends in growth of my thumbnail are reported. Various observations, including slowing of the rate of growth with infections, are recorded.
The slowing of the rate of growth has progressed in somewhat irregular phases. This is a phenomenon that most people observe if they care to introspect themselves as they participate in the aging process.
The average daily rate of growth has varied from 0.123 mm per day when I was 32 → 0.100 mm when I was 61.
…5 more years of nail growth have not added any new findings as the rate stabilized from age 53 → 57.
Growth of deciduous tissues gives us a natural kymograph to record secular trends, and in some instances makes the mark on the moving record.
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