Good on your OP. Search Wellington house , it’s a detox place in boxhill . Try to ring them and find out about intake criteria . It’s free service available to anyone with Medicare. I know success of detox depends on person’s readiness for change but being in a detox ward will give his body a much needed break . Being free from drugs will also give him mental Clarity. He may leave halfway but it will expose him to a healthy lifestyle. If Wellington refuses to take him because of his age . Google direct line and enter your suburb details . It will give you list of drug and alcohol services in your area . Other good rehabs are MARP , windana , odyssey etc