10Transfer to prison of persons over twenty-one, and maximum age for detention in young offenders institution
(1)Subject to the provisions of this section, where a person serving a sentence of detention in a young offenders institution has attained the age of twenty-one years, the Secretary of State shall have power to transfer him to prison.
(2)No person shall be detained in a young offenders institution after he has attained the age of twenty-three years, and accordingly any person so detained shall, not later than the day immediately preceding his twenty-third birthday, be transferred to prison.
(3)Where a person has been transferred to prison under this section, he shall be treated for the purpose of his serving the unexpired part of his sentence and of his supervision on release as if the sentence of detention passed upon him were a sentence of imprisonment for a like term, and the provisions of this Act and of the Prisons (Scotland) Act 1952 relating to the treatment and supervision of prisoners shall apply to him accordingly.