send not to know for whom the birthday candle flickers, it flickers for me

Him: "I woke up at 4 today. I couldn't get back to sleep. I'm wondering what to do for your birthday."
Me: "Nothing! I don't want you to do anything for my birthday."
Him: "I have to do something. You're only 40 once."
Me: "Oh no. That's not true at all. I'm going to be 40 for, like, the next 4 years."