Enhancing Vitality and Boosting the Immune System Designed for cats 7 and older, Iams Active Maturity Hairball Care formula enhances your cat's vitality and reduces the effects of aging. Active Maturity is made with an exclusive antioxidant blend with vitamins E, C and A that work together to boost the immune system response of your older cat. Its gentle fiber blend promotes a healthy stomach and digestive system, while reducing hairballs, waste and litter-box odor.