London Underground have 42 year old trains (72ts which entered service 1973-1974) that under current plans won't be replaced for the next 8-10 years, and are looking like they'll reach half a century in service. The 73ts (entered service 1975-1977) have their 40th birthday this year, and again under current plans they'll be close to 50 when they're replaced.
The 313s entered service 1976-1977, which makes them the same age as 73ts, but the 315s only entered service 1980-1981 so are about half a decade younger.
Yet no one moans about the older LUL stock,which also have no clear plans of replacement, unlike the 313 and 315 that shouldn't be in London service beyond 2019

:roll: