"Amy, I'm over 900 years old. I haven't had a birthday party in centuries. Why should I have one now?" The Doctor argued.
"Because everyone should have a birthday party," Amy said stubbornly. Rory just shrugged. Which is how the kitchen ended up looking as if something had exploded, and in the end they just chose a small cupcake with TARDIS blue icing and a single candle. Amy and Rory insisted on taking the Doctor around the city- in present day times. They went bowling, had ice cream, and generally just messed around. At the end of the day, when they were all safely back in the TARDIS, the Doctor admitted it had been wonderful.
"Thank you," he said. "For a wonderful birthday."