There is no upper age limit for neutering your cat. You may wish to have your cat neutered if you acquire it as an adult or you may want to have a litter or two before your cat is retired as a breeding animal. Tomcats can also be neutered later in life and this may reduce certain types of antisocial behaviour such as spraying. But the older the male is, the more likely that it will carry on showing the less desirable behaviour traits such as aggression or mounting. If older males develop prostate problems, castration may be recommended as the treatment.