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Relationship between age and terminal duct lobular unit (TDLU) counts, TDLU span, and category of acini counts/TDLU. A lowess function was used to estimate the average of TDLU counts, median TDLU span, and median acini counts/TDLU, as a function of age. The number of acini/TDLU was recorded in categories (1 = <=10, 2 =11–20, 3 =21–30, 4 = 31–50, and 5 = 51+). TDLU = terminal duct lobular unit.
