Shah Rukh Khan in Dhoom 4 ?

The actor, who turned 49 yesterday, said he feels younger as he gets older. "I don't understand the age at all. Physically, I feel better. From tomorrow, I will be starting my film Fan. I don't know what is one supposed to feel as one gets older. Is one supposed to get fatter, is one supposed to have less energy I don't know. May be I am regressive. The more I am growing the more I feel I am younger. I don't know how to react to the number," he said.