Under the Road Safety and Transport Regulations 2021, how long is an ordinary two-wheeler or light-vehicle driving licence valid, and what changes once the holder turns 70?

1. It is valid for life and never requires renewal
2. It is valid for five or ten years until the holder attains 70, after which renewal is every three years subject to certification by a medical doctor
3. It is valid for one year and must be renewed annually from the date of issue
4. It is valid for twenty years, then renewed every five years with no medical requirement