a priority working to replace them. we will keep you updated. >> thanks. we know president biden is old but how much time does he have left? may sound an indelicate e-question but the media is speculating about his life expectancy. he's running for reelection. would e-he make it another six years? fox medical contributor joins me. dr. siegel i think i know people who are older than joe biden who are in complete control of their men the at all and physical faculties. i don't think it's about he's 80. he seems to be degenerating in a way i've seen much older people not degenerate. >> i agree with you and i've separated out. i think it's a question of cognitive fitness and fitness