What Is the Best Age to Start ABA Therapy? The research evidence is strongest for early intensive intervention in children under age 5. But "best age" is a slightly misleading way to frame it. In practice, the best time to start ABA is as soon as autism is identified, at whatever age that happens. Families who ask this question are often asking two different things. Some are wondering whether their young toddler is old enough to benefit. Others are asking whether they missed a window and it is t
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