I'd have to say from my Dad as well, I've been hunting since 7yrs old
and I'll be 43 next month.I still hunt with my Dad and still learn from the old fart every year,he say's he aint taught me everything yet.
He's the only man I've seen shoot a running deer broadside with a long bow and not have it go more than 35 yards before falling!
That's no shi*!

They say you can learn a lot from books, but just think how much experience and books a man can learn from in a lifetime.
Although somethings change with time,a lot of stuff when it comes to hunting and knowing your game you hunt, stay's the same.