3. Qualifications for being engaged as an apprentice.- A person shall not be qualified for being engaged as an apprentice to undergo apprenticeship training in any designated trade, unless he--
(a) is not less than fourteen years of age, and
(b) satisfies such standars of education and physical fitness as may be prescribed: Provided that different standards may be prescribed in relation to apprenticeship training in different designated trades 2[ and for different categories of apprentices.]