At least, according to the NIMH:

Stimulant use among U.S. children ages 18 and younger had increased sharply from 0.6 percent in 1987 to 2.7 percent in 1997. By 2002, however, the estimated use was only 2.9 percent, suggesting that the rate of use has leveled off. Use was highest among 6- to 12-year-olds (4.8 percent), and lowest among children under 6 years old (0.3 percent). The low rate among preschoolers was also the most stable, countering fears that preschoolers’ use of ADHD medications is escalating.

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