Horses all pretty much have the same lifespan..they aren't like dogs where large breeds have shorter lifespans. These days, with proper care, 20-25 is probably average though you do get the occasional 30 yr+ versions. We have a mare at our barn, a TB/Warmblood cross, that is 26. She's slowing down a bit but still active. She takes her owner out every day for a trail ride.
In the case of horses I think "aged" starts at 10..at least that is what AHSA (American Horse Show Association) used to say when registering for classes. Of course it depends upon the individual animal. For some 10 is the age where they are just getting started :) but for others they are ready for retirement.
Last edited by tlkng1; 07-08-2013 at 06:41 PM.