J.T. tells Cody he is 19 which means h would have made him born in 1973. Sasha Mitchell was born in 1967, which made him 24 at the time.
Cody is in this episode at the beginning and it's his birthday. What's unusual is his grandfather comes to town and he does not mention anything about Cody or his birthday and does not even share any scenes with him.
Cody only appears in the cold open of this episode