drivers medical

had my licence for 18 months now, wondering do i need to have a drivers medical every so many years, if so how many?

thanks

If you were under age 40 when you passed the last D4 medical then the next D4 medical is at age 45, 50, 55, 60, 65, 66, 67,68 …

ROG:
If you were under age 40 when you passed the last D4 medical then the next D4 medical is at age 45, 50, 55, 60, 65, 66, 67,68 …

yeh i was 26