Lifestage cat foods Hill’s Science Plan is 100% balanced and healthy nutrition, led by science to give pets the best and longest life possible. Not too much, and not too little – just the precise nutrients your pet needs to feel their best at every stage in life. Kitten (up to 1 year old) Supports healthy brain development. Adult 1-6 Specially formulated to fuel the energy needs of cats during the prime of their life. Mature Adult 7+ Supports their everyday ability to get up and go. Senior 11+ Supports heart, kidney and bladder health & promotes beautiful fur.