Eligibility to be a private security guard:

(1) A private security agency shall not employ or engage any person as a private security guard unless he -
(a) is a citizen of India or a citizen of such other country as the Central Government may, by notification in the Official Gazette, specify;
(b) has completed eighteen years of age but has not attained the age of sixty-five years;
(c) satisfies the agency about his character and antecedents in such manner as may be prescribed;
(d) has completed the prescribed security training successfully;
(e) fulfils such physical standards as may be prescribed; and
(f) satisfies such other conditions as may be prescribed.

Private Security Agencies (Regulation) Act