Is a low dose of aspirin safe for a cat?

If you want to give him a better quality of life, bring him to a vet so they can prescribe a medication that is safe for the cat to take. Human medications are never ok to give pets unless you are given a dose by a vet, but I can guarantee that no vet will tell you to give your cat baby aspirin. Cats are much different than dogs in their ability to tolerate different chemicals. Always, always, ALWAYS check with a vet before giving your cat any medication not marketed for cats.