More than half of US senators are over the age of 50, some of those are over 60 or even 70. All are very wealthy. They claim to be in touch with the needs of the average American but their actions often prove them outdated in thinking.
Chances are very likely at least a few of them also experience senility or other geriatric conditions which afflict thought and judgement.
Is it not prudent to safeguard against this in the largest ruling house in the country?