Table 4.

Estimates of the words known by 20-year-olds and 60-year-olds at the low end and the high end.

Person	Number of alphabetical types encountered	Number of lemmas known (max = 61,800)	Number of base words known (max = 18,300)
20-year-old
Low end	84,000	27,100	6,100
Median		42,000	11,100
High end	292,000	51,700	14,900
60-year-old
Low end	157,000	35,100	9,000
Median		48,200	13,400
High end	543,000	56,400	16,700