Hi Teo Jmeng! If you possess a valid Singapore Driving Licence and are 65 years old and above, you need to be certified fit to drive by a Singapore registered medical practitioner. About 8 weeks before your 65th birthday, you should receive a letter informing you to go for a medical examination and a medical form. More details can be found here: https://www.police.gov.sg/Advisories/Traffic/Traffic-Matters/Application-Replacement-and-Renewal-of-Singapore-Driving-Licence