It's not the lack of sharpness I'm so worried about, it's the apparent lack of joy he looks to take in playing football these days.
It is normal. Especially considering the fact he was never all that obsessive to begin with and has likely come to the realization that the better part of his career is done with. That does not mean he is going to stop being the best in the world anytime soon, but just look at the bloke:
He looks 10 years older now than he did 2-3 years ago. He has also has a family and has already proven everything at club level. You cannot expect the same enthusiasm from him that he had at 22 anymore.