By what age do most individuals with cerebral palsy reach maximal function?

• A. By age 6 or 7
• B. By age 12
• C. By age 3
• D. By age 18

Answer: (A)

In cerebral palsy, motor development tends to reach its highest level of function during early childhood. The brain injury is non-progressive, so the neuromuscular system matures and most achievable motor patterns stabilize by about the time a child enters and moves through the early school years. By roughly 6 to 7 years of age, many children have achieved their peak gross motor function, and substantial gains after this point are unlikely, even with therapy, though ongoing work helps maintain and optimize what they have and address secondary issues.

Choosing a much younger age, like 3, would suggest maximal function is reached earlier than is typical, while picking older ages such as 12 or 18 implies a later plateau that isn’t consistent with common clinical trajectories observed in CP.