always used to be 3yrs for totting up & removed afer 4 yrs, last time i got any points was back in 1992 in a XR3i, i went up to 9 points twice back then. I speak for myself but when i was a teenager & early twentys i drove like a lunatic, now i'm 35 i save it for the track as its not worth loosing your licence.
Goodluck
Simon.