Is the presidency wearing on the POTUS?

It is known that serving as the President of the United States has an effect on the man. As the close of their terms near, each and every man has stepped off the pulpit with a different color reigning in atop.

Noticing lately some of the pictures of the present POTUS, one can't ignore new streaks of the opposing color....seems to be nearly salt&pepper actually. This is just after one year.

This is in 2010





This was taken in 2008