Can I be a Doctor too?

I have never really been big on titles. I always thought it a bit ridiculous when people change the title on their credit card to doctor the day after they receive their PhD.
But when it comes to Dr. P, my view changes. I mean it wouldn't be the same to call her P, would it? I was very proud when she finished her PhD and ever since have called her Dr. P. So when we applied for a joint bank account I made sure she wrote Dr. as her title. And of course being a Dr. myself, I didn't want to be left out so despite my former views, I wrote Dr as my title too.
I have to admit, I was a little disappointed when our cheque book came with Dr. P and Miss A written boldly on each cheque. Totally unfair, I was a Dr. nearly five years before Dr. P!!! I have been a doctor twice as long!! Infact, it should say Dr. P and DOCTOR A. But it doesn't and I guess I would be a right plonker if I wrote to them demanding the change.
So I'll just stick to being Miss A and Dr P can continue to turn red when they call over the tannoid at the airport "Would Dr. P please go immediately to gate 13, where you are delaying your flight". Who would expect that of a German Dr?????