I agree, I love the Seminole feeds. A horse is only as old as you make them out to be... What made you think she needs the senior feed over what she is already eating? I know a 37yr old horse that is STILL eating the same feed since he was 9!

And he is in great shape.
Just because she would be on senior feed would not mean that she wouldnt still need extra supplements. As always, for the best advice, ask your local vet who has experience and knows your mare. The both of you could make a better decision than what we could tell you.
Brittany