Mo. Rev. Stat. § 516.170: May delay filing of action, when.

Except as provided in section 516.105, if any person entitled to bring an action in sections 516.100 to 516.370 specified, at the time the cause of action accrued be either within the age of twenty-one years, or mentally incapacitated, such person shall be at liberty to bring such actions within the respective times in sections 516.100 to 516.370 limited after such disability is removed.