The sum of angie's age and john's age equals michael's age. angie's age is a prime number, but john's age and michael's age are not prime numbers. The sum of john's age and michael's age is a prime number, and angie's age minus john's age is a prime number. One more than half of john's age is a prime number. Angie is the only teenager, and she is older than john. How many years old is john?