The medical certificate should be renewed periodically the frequency of renewal also varies according to a license type and your age. A Class 1 medical certificate used to obtain Commercial Pilot License (CPL) and Airline Transport Pilot License (ATPL) requires both age-based (pilots under 40 years of age must renew once per year pilots over 40 must renew once every six months) and time based renewals. In the case of a Class 2 medical certificate that must be obtained in respect of a Student Pilot License (SPL) and a Private Pilot License (PPL) the renewal can be done every 60 months before the age of 40 or twice a year or every 24 months after 40. These certificates assure that you are fit physically and mentally able to fly an aircraft safely and this is integral to issues of pilot eligibility.
One should plan in advance to renew a medical certificate because flying with an expired certificate is not permitted in the aviation regulations. Alongside the ability to fly with a valid medical certificate gives you a level of compliancy as well as peace of mind in front of the instructors and airlines that you qualify as being fit to fly. Check ups can keep alert on any impending health problems thus servicing your pilot certification right up to your retirement. By remaining proactive in renewals, you will be able to have uninterrupted training and flying.