Insightful, but makes ya wonder!

Last night Sunny and Tony were joking around. talking about their birthdays, which are ten days apart.
Sunny was rubbing it in that her day on the calendar is more decorated than his.
He said " Haha, my birthday is first."
She said: "But, I'm actually having a real birthday party"
Tony "Well I'm gonna be older than you."
And Sunny summed it up by saying " So what, the older you get the sadder you get."