He was last seen on Saturday (March 10) going for a walk along the coastal path near the town of Cardigan in Wales.
He was wearing a black V-neck jumper and jeans, and has four earrings in his left ear. He was carrying a hooded top and rucksack.
Anyone who has any information should contact Dyfed-Powys Police by phoning 101 (outside Dyfed-Powys, phone: 01267 222020).
Find out more at www.thereasoning.com