Police are appealing for information on the whereabouts of Mr Tengh Koo Yam, 83.
He was last seen in the vicinity of Serangoon Avenue 2 on May 6 at about 7.30am.
Mr Tengh is Chinese and has a fair complexion. He is about 1.62 m tall and is thin.
Anyone with information on his whereabouts can call the police hotline at 1800 - 255 0000.