A person commits the offense of unlawful possession of firearms or firearm ammunition when:
(A) He or she is under 18 years of age and has in his or her possession any firearm of a size which may be concealed upon the person;
(B) He or she is under 21 years of age, has been convicted of a misdemeanor other than a traffic offense, or adjudged delinquent and has any firearms or firearm ammunition in his or her possession;
(C) He or she has been convicted of a felony under the laws of this or any other jurisdiction within five years from release from the penitentiary or within five years of conviction if penitentiary sentence has not been imposed, and has any firearms or firearm ammunition in his or her possession;
(D) He or she is a narcotic addict and has any firearms or firearm ammunition in his or her possession;
(E) He or she has been a patient in a mental hospital within the past five years and has any firearms or firearm ammunition in his or her possession; and/or
(F) He or she is mentally retarded and has any firearms or firearm ammunition in his or her possession.
(Ill. Rev. Stat., Ch. 38, § 24-3.1) (1994 Code, § 27-6-3) Penalty, see § 130.999