Is it possible to keep condition?

[polopony]

Our mare is 32yo and has barely any teeth left but manages to chomp through our soft hay and is on a veteran mix with chaff, which she manages well. She is unclipped and turned out in her heavy weight rug. But we've noticed that she's started to get rather thin, we've just let her into a paddock with more grass, but I wondered if there are any ways to keep condition on, or is weight loss inevitable in a golden oldie?

 

[team barney]

my oldies (all 30 -/+) eat more than twice the feed they did when they were a few years younger. They have maintained their weight excellently this year eating ad-lib haylage and lots of nuts, and sugar beet, and a little oil for the stiff legs.