I have a 25 year old nanday conure and not sure how much longer their life expectancy is. He had lost all his body feathers about 10 years ago due to improper feeding. After changing to a regular diet he was fine but has all his body feathers missing. About a year ago he had some spots developing in his one eye and I took him to the vet and he gave me some eye drops. He still has the cloudiness in his eye and he looks skinny. Can this be due to old age or should I look further into this.