windsong Farm in Minn has a great program, if unusual. they use 10-12 year olds. They're told not to offer advice on clubs, yardages or putts, and the golfers are told this too. all they do is carry your bag.
I had a great time with this. my game was all mine. i couldnt rely on the caddie, and i didnt get distracted by him either--no bad reads, nobody trying to jabber themselves into a better tip.
The boys were boys, getting distracted sometimes and tiring a little, but some encouragement brought them right back. I cant tell you how much fun i had going around with a young person who was just glad to be there, and how much fun it was to see his eyes light up when i paid him a fee that was HALF what the "pro loopers" get here in in the new york metro area.
it made the game a little simpler, and reminded me of why i play golf in the fist place.
I also second the Pebble Beach nomination for worst caddie program. I walk/take a looper 25 of 30 rounds per year, carry a "drainpipe" type bag made by mackenzie. its the lightest bag i've found apart from those "moon" bags.
My pebble looper insisted on pulling all my clubs out of my bag and using "his" bag anyway. maybe not a big deal to some, but I don't like paying $100 plus for a loop, and then getting my luggage switched without so much as a request, much less a choice. started my day off badly.