The average age of the 118th Congress is 58 years old. The average age of the Senate is 64 years.

Source: https://fiscalnote.com/blog/how-old-118th-congress

For most people with Alzheimer's — those who have the late-onset variety — symptoms first appear in their mid-60s or later.

Source: https://www.nia.nih.gov/health/what-are-signs-alzheimers-dis....

So, yeah. Of course there are individuals in Congress on Alzheimers drugs.

Edit: Oh, and Mitch has frozen up for a second time: https://www.bbc.co.uk/news/av/world-us-canada-66663389.

There really should be a baseline health test that people in public office must pass.