20.—(1) A person under 18 commits an offence if he does anything which would be an offence under any of Articles 16 to 19 if he were aged 18.
(2) A person guilty of an offence under this Article is liable—
(a)on summary conviction, to imprisonment for a term not exceeding 6 months or a fine not exceeding the statutory maximum or both;
(b)on conviction on indictment, to imprisonment for a term not exceeding 5 years.