How old was he?
Ok. He was a minor.
At that time, there would have been a prohibition upon his prosecution for the criminal offences and anyway generally speaking CPS won't prosecute stale offences of violence.
You are also out of time to bring a personal injury claim. You had three years from the date of your eighteen birthday as that is the date upon which you are released from the disadvantage of being a minor.
There is also a causation issue as you have to prove that this was caused by his actions and not aggravated by anything else.
I'm very sorry but that is the reality.
Can I clarify anything for you?
You still have the problem of being out of time in either case.
If there haven't been any attacks for 30 years they are not likely to start now but you could always have nothing do with him.