[aaronem]

Well, to be sure, the job always seems to turn their hair white.

On the other hand, I'm easily cynical enough to wonder whether a modern president's staff hairdresser is expected to have an unusual degree of skill with dyes and bleaches.

[afterburner]

Or:

Before election: dye hair, look energetic.

After election: don't bother dyeing, look like you're settling into the position.