Horseface

Here are some questions. For every one that goes unanswered, I will kill one cute animal in the following way: first, I will club a kitten and feed it to a penguin. Then I will electrocute the penguin and feed it to a basset hound. Then I will strangle the basset hound and feed it to an otter.

These questions are about horses. I try to find this info online, and just get information on how to properly GM a game with a horse, or on the Elven horses of Mithrandir, etc.

1) What's the average horse lifespan?

2) Is there any special term for a junky farm horse? Like, Rominger had this old beige horse that didn't really do anything but wander around and occasionally--occasionally--haul around equipment.

3) Rominger used to have this big tank in his yard, with holes, and one hole was about mouth level, and you could lean in and speak and it echoed so loud. Also you could beat it for a very loud effect. Any idea what this tank might have held? (okay, this is not a horse question...but what if i told you that there was a picture of a horse on the side? Well, there wasn't.)

4) For the horse in question two, what's a sort of average guess at the cost of upkeet? feed, etc.

If anyone has approximations or informed guesses, that'd be lovely.