Geldings 20 y.o. good health

I have 2 gelding horses that have been together many years and have been riding each one at different times. I am happy with their health as they are both over 20. They are both easy keepers and are being fed alfalfa and Timothy pellets with whole corn and whole oats. I mix in corn oil and minerals to keep them healthy. Their coats are shiny and hooves are looking good. I have their negative coggins this month and they have not been around any other horses for almost a year. They get along with dogs and cows. Stand for ferrier and bathing. They load and tie. Neither is for beginners because they do not have enough miles in them , so far. Looking to sell to good home.