[Pikamander2]

The average age of Congressmen has increased, but much of that can be attributed to modern medicine and gerrymandering and the incumbent effect letting existing Congressmen stay in office for longer periods of time.

As far as the presidency goes, it's hard to draw any strong conclusions due to the small sample size and flawed two-party system. Our last two presidents have been very old, but neither was particularly popular with the voter base as a whole. Plus, Bill Clinton and Obama were very young and were elected just a decade or two prior and enjoyed a higher margin of victory and approval rating.