This is the most surprised I've been by Doctor Who in a long while -- and you know how often the shocks come on that show.
It appears between the events of Saturday's "The God Complex" and next week's "Closing Time," a whopping 200 years will have passed for the Doctor. That's the biggest chronological time-jump the show has ever taken for the Doctor.
This will bring us up to speed with the Doctor we saw in "The Impossible Astronaut," who was 1103 years old. As you probably remember, that's when the Doctor is killed by the astronaut on the shores of Lake Silencio. It looks like that showdown will definitely occur in the finale.
It's an interesting choice, creatively. Look at it this way: within the show's timeline, the Tenth Doctor (David Tennant) was only around for roughly six years (age 900 - 906), or only .5% of the Doctor's total lifespan thus far. Matt Smith's Eleventh Doctor, though, hangs around for about 197 years, a whopping 17% of the Doctor's total lifespan. The longest-lived incarnation of the Doctor, though, is still the first (William Hartnell), who was at least 400 years old (36%) by the time he first regenerated.
Wibbly-wobbly, timey-wimey indeed.
Doctor Who will air "Closing Time" Saturday, September 24, on BBC1 in the UK and BBC America in the US.