"What would you steal from the Eleventh Doctor?" David: "I love his TARDIS, it's a wonderful piece of work." "What would you steal from the Tenth Doctor: "Rose, 'cause I love Billie, she's a good friend." "So they want to steal each other's girlfriends?
The Doctor's age - that moment when you realize it's been 300 years since he lost Rose Tyler. :'( <--- WWHHHYYY<<The moment when you realize he spent 100 years traveling without the ponds