Household cats usually reach a very old age, some reported to be reaching up to 20 years. Health issues usually arise when cats reach their golden years, like humans do. According to Hill’s Pet Nutrition, illnesses and ailments affecting older cats are quite similar to what senior people deal with. The most common ones are arthritis and heart problems, but there have been reported cases of cancer in some cats. As a responsible pet owner, you wouldn’t want to see your them suffering, and knowing that there’s actually something you could do about it.