If your dogs don’t have any health issues, they can eat any food whether it’s an “all life stage” food or one that is for “maintenance”. Seniors still need the same (if not better) food as adult dogs and most foods marketed for “seniors” are full of fillers and high in carbohydrates. Pick a regular food.
http://healthypets.mercola.com/sites/healthypets/archive/2012/06/20/aging-pet-food.aspx
http://healthypets.mercola.com/sites/healthypets/archive/2011/05/05/surprising-findings-from-tufts-study-of-37-senior-dog-foods.aspx
