29 C.F.R. § 570.2 : Labor — REGULATIONS RELATING TO LABOR — WAGE AND HOUR DIVISION, DEPARTMENT OF LABOR — REGULATIONS — CHILD LABOR REGULATIONS, ORDERS AND STATEMENTS OF INTERPRETATION — GENERAL — Minimum age standards

(a) All occupations except in agriculture.
(1) The Act, in section 3(1), sets a general 16-year minimum age which applies to all employment subject to its child labor provisions in any occupation other than in agriculture, with the following exceptions:
(i) The Act authorizes the Secretary of Labor to provide by regulation or by order that the employment of employees between the ages of 14 and 16 years in occupations other than manufacturing and mining shall not be deemed to constitute oppressive child labor, if and to the extent that the Secretary of Labor determines that such employment is confined to periods which will not interfere with their schooling and to conditions which will not interfere with their health and well-being (see subpart C of this part); and
(ii) The Act sets an 18-year minimum age with respect to employment in any occupation found and declared by the Secretary of Labor to be particularly hazardous for the employment of minors of such age or detrimental to their health or well-being (see subpart E of this part).
(2) The Act exempts from its minimum age requirements the employment by a parent of his own child, or by a person standing in place of a parent of a child in his custody, except in occupations to which the 18-year age minimum applies and in manufacturing and mining occupations.
(b) Occupations in agriculture. The Act sets a 16-year age minimum for employment in agriculture during school hours for the school district in which the employed minor is living at the time, and also for employment in any occupation in agriculture that the Secretary of Labor finds and declares to be particularly hazardous except where such employee is employed by his parent or by a person standing in the place of his parent on a farm owned or operated by such parent or person (see Subpart E-1 of this part). There is a minimum age requirement of 14 years generally for employment in agriculture outside school hours for the school district where such employee is living while so employed. However, (1) a minor 12 or 13 years of age may be so employed with written consent of his parent or person standing in place of his parent, or may work on a farm where such parent or person is also employed, and (2) a minor under 12 years of age may be employed by his parent or by a person standing in place of his parent on a farm owned or operated by such parent or person, or may be employed with consent of such parent or person on a farm where all employees are exempt from the minimum wage provisions by virtue of section 13(a) (6) (A) of the Act.

29 C.F.R. § 570.2