The first picture...she looks very thin. Almost sick looking. Her neck is very thin and has that sunken look to it. Ribs are showing even through a winter coat. The color of the photo is off, but her coat looks dull. Eyes look a little listless too. Based on that picture...id guess she was mid-20s. But, She's your horse, you know her best...
I saw in another thread you wanted to get her checked for ulcers. I'd definitely recommend that.
She needs a top line and weight/muscle...which in turn needs proper conditioning and a good diet. I'd cut out the Sweet feed and add a good Senior pellet into the mix. Nutrena SafeChoice makes an incredible Senior formula.
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