I now want the fic where Amy celebrates two birthdays, one where she turns a year older, and one on the day of her birth. Her parents get invited to the second one (unless they're in like BC or outer space), and the first party is the really fun one. And just when she's about to turn 30, the Doctor introduces her to Planet X years, which make her 21 again (this is how the Doctor is always, always 900 years old, unless he's dealing with a companion in which case he lets his age go up so they don't get confused with the time travel and all).