Sax student playing flat

Hello. I have a "young" 63 year old man who has always wanted to play the saxophone. He has no previous musical experience. He's had 6 lessons so far. His tone is good, he's using his abdomen to blow through the horn. The problem is that he's consistently playing a semitone flat, both on his YAS23 rental, and his new Jean Paul AS400. I have tried everything I can think of to get him to play in tune, save for discussing where his tongue is. Any ideas to help me out?
 
I did indeed. I was able to get the student to play in tune by changing the position of his tongue. Once he's in tune, I have him sing the note, so he can hear when he's playing flat. My student is a young 63 year old man, btw.
 
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