William was last seen leaving his Bluegum Court address about 11pm last night.
It’s believed he left the address on foot and may have walked along the Badger Creek Trail.
Investigators have released an image of William in the hope someone may have information on his whereabouts.
William is described being about 180cm tall with brown hair and a scruffy beard.
Anyone who sees William should call Lilydale Police Station on (03) 9739 2300.