Stunted fish is when a normal fish do not grow properly and often living in poor conditions or due to lack of foods. The stunted fish usually don't live longer and do not confused stunted fish with slow-growing fish, its two different things. Short bodied fish with spinal deformity often will live longer and have same lifespan as their normal cousins do. Fancy goldfish don't live longer as their single-tailed cousins but if they are in good husbandry they will live up to 15-20 years. Anyways most goldfish (fancy or not) do not live longer due to the abuse. Blood Parrots will live up to 15-20 years as I have a blood parrot that is 10+ years old right now.