. . . "as the Comptroller thinks fit, and under such conditions as to forfeiture, penalty or otherwise as the Minister may direct. (4) Any bond or other security entered into or given under this Act by a person under the age of 21 years (otherwise than as a surety or guarantor) shall have the same force, effect and validity as if that person had been of full age. (5) Without limiting the power to make re" .