I found this maths riddle in an article and i can't work it out!!

somethings telling me this is easier than im making it and it should be quite simple??

His boyhood lasted 1/6 of his life, he maried after 1/7 more, his beard grew after 1/12 more and his son was born 5 years later, the son lived to half the fathers age and the father died 4 years after the son.

how long did the father live??

Any help would be great

cheers

Alex