Transport for London's (TfL) latest figures, from 31 August 2021, show that 1,228 vehicles will be over 12 years of age and will not be eligible for licensing from 1 November 2021. Between 1 November 2022 and 31 October 2023, vehicles that are older than 11 years of age will be ineligible for licensing.

In London, the age limits for the iconic black cabs (Hackney Carriages) are strictly regulated by Transport for London (TfL) to ensure the city meets its ambitious air quality and environmental targets. As of 2026, the maximum age limit for non-zero-emission capable (ZEC) taxis is generally 12 years. However, this limit has been part of a phased reduction from the previous 15-year cap to encourage the adoption of cleaner vehicles. For a taxi to be licensed in London today, it must be ZEC, such as the LEVC TX electric model. Taxis that are already fully electric or meet the most stringent zero-emission standards may sometimes benefit from slight extensions, but the overarching goal is to remove older, polluting diesel engines from the fleet. This "rolling" age limit means that a vehicle must be decommissioned or replaced once it hits its birthday based on the date of its first registration. These strict rules ensure that London’s taxi fleet remains one of the most modern, accessible, and environmentally friendly in the world, even if it means owners must invest in new technology more frequently than in other cities.