What is the oldest staute still in use in English law?

[10ClarionSt]

What is the oldest statute in English law that has been used to prosecute someone in modern times?

[Gmcd01]

I'm not sure about the oldest, but I'm sure it's on Wikipedia somewhere (That bastion of reliable sourcing). I would suggest that the Offences Against The Person Act 1861 is probably the most well known piece of 'victorian' legislation, and yes, it badly needs codifying. Mostly you will find archaic common law rather than statute law; a quite commonly used principle is one from Tuberville v Savage (1619)...

[dannydingbat]

All taxi control is still operated under the 1847 Town Police Clauses Act so things like overcharging, refusing to carry a passenger. or failing to maintain vehicles properly is done under that Act,

[Grunty]

Although there are a few older statutes that still have a bearing on modern practices, binding people over to be of good behaviour is done by the Justice of the Peace Act 1361.

[Nether Edge]

Grunty is prbably right.
The oldest Acts still in force, however, are so old that they are undated!
Statutes of the Exchequer and Statute concerning Tenants by the Curtesy of England [no, I don't know either] pre-date 1267.
There are Acts also dating from 1267, 1275, and 1285. The Commons Act 1285 is the oldest to have been (susequently) given a proper name as a short title.
And the Treason Act 1351 created criminal offences pre-1361. That might be the oldest for your purposes.