Matt Smith reckons he'll get traded in for a "younger, cooler person" on Doctor Who some day.
The actor has won critical acclaim - and a best actor gong at last week's National Television Awards - since he was announced as the 11th Timelord in 2009. But the 29-year-old admitted he wouldn't be playing the role forever.
"I just sort of take each year as it comes really. We've got all the rest of this year to get through and then we'll just sit down and review it from there and see where it goes," Matt said.
"But I love playing the part and I love working with (writer) Steven Moffat."
Referring to Tom Baker, the longest-running Doctor Who from 1974 to 1981, he added: "I think there will need to be a younger, cooler person than me - or maybe an older, cooler person, who knows? But I don't think I'll be doing it as long as Mr Baker."
Shooting on the new series starts mid-February and Matt - who will be joined by a new sidekick following the departure of co-star Karen Gillan - said he stays healthy to cope with the hectic filming schedule.
"Fruit, vegetables, good sleep if you can and preparation is the key," he explained.