I know there going to be variations.  But I never really thought bout it til I been reading how many feed a senior feed, which I know a senior feed gets fed to lots of young horses.  So just curious

Now and days, 15 is the start of a senior horse (as I've heard).

Also, just because a horse is under 15 years old, doesn't mean they can't have a senior feed. Horses that struggle with weight (such as hard keepers) or rescue horses are usually put on senior feeds. In addition, a horse with teeth issues that struggle to break down other grains may benefit from senior feeds.

A senior horse to me is when they hit 18 to 19.. Horses now adays are fed so much better with all the great feeds and supplements out there so I think horses age way slower now then what they use too back 20 years ago. People are so much more savvy now adays about how to care for their horses.

I think 18+ would be my opinion. I have 2 in their 20s and besides the white hairs coming in on their faces you'd never know they were older. And I've still never fed a senior feed, they don't even eat grain at all now. I think senior feed nowdays is used more for hard keepers/rescues than actual senior horses. It's usually full of molasses, which none of mine can have at all so I've never been interested to try it. One of them I did have to start checking dental on 2x a year when he hit 20 but not the other. And they do move a little stiffer if I don't have them on joint support, but otherwise you'd look at them and think they were like 15. So I'd say around the 18+ mark becasue a lot of times they start needing maybe just a hair bit of extra care/maintence to keep them going just as strong