The Senate needs term limits. This is ridiculous.
Neither Sanders nor Biden have to serve a second term. If people are truly uncomfortable with their ages then they will not vote for them. This is not the same as an entrenched incumbent stubbornly refusing to give up his/her seat.
Refusing to give up their seat? The people could just vote them out.
Yes. Cochran has a Titanium R seat. He won't exactly be taken out in a D wave. They also have advantage of high name recognition, intimidating donor advantages, and state party support that keep stronger candidates from primarying them.
That's unfortunate but you can't take power away from the people - if they're happy with him, they'll re elect him. term limits are an arbitrary creation that serve no purpose.