Since Nicky Jr got shot in 1989 when he was 24, that would make him as being born in 1965. So, he would of been about 21/22 when his dad went away in January of 1987. Definitely a young age to be made at.
Skinny Joey would of been 24, almost 25. I'm presuming the rest of the Young Turks were all around similar ages when their dads/uncles/brothers all went away..