Senator Dianne Feinstein is back at the nation’s capital this week after being absent for nearly three months due to a serious case of shingles, just weeks shy of her 90th birthday.

And it’s re-sparked conversations about her ability to serve in the senate, something that’s been talked about a lot in the past few years. 

So what are the consequences of her holding onto her seat? And why is it so complicated to talk about aging in politics?

To get some insight, KCBS Radio’s Mallory Somera caught up with James Taylor, Professor of Politics at University of San Francisco.