The document summarizes a graph showing changes in internet usage by age group in Taiwan from 1998 to 2000. It states that young adults between ages 16 to 30 have consistently been the largest user group, making up over half of users in 1998 and around 45% in 1999-2000. The second largest group was ages 31 to 50, who saw small declines over this period. While those aged 16 to 50 still represented over 90% of users in 1998, this share declined as usage increased more rapidly among children under 16 and older users over 50, nearly quadrupling and doubling respectively.