Joel was last seen leaving an address in Armytage Road at 1pm on Friday.
He is believed to have travelled to Bromley via public transport and is known to have links with the Bromley area.
Joel is slim with black hair and was last seen wearing a black Nike hat, a blue Adidas tracksuit with a black jacket and navy blue sliders.
If you have seen Joel or have any information about his whereabouts, please call 101 and quote the reference 5762/23Mar.