(CNN) Democratic presidential hopeful Joe Biden committed to publicly releasing his medical records before the Iowa caucuses after questions of whether the 76-year-old former vice president is fit for the rigors of the presidency and to take on President Donald Trump, aged 73, in a grueling 2020 campaign.

In Houston on Friday, a day after the third presidential debate , the Democratic frontrunner was asked by a reporter if he will be disclosing his medical records to address worries about his age.

"Yes," Biden said, then with a quip, "What health concerns man? You want to wrestle?"

Asked about the timing, Biden said he'll release his medical records "when I get the next physical" exam and "before there's the first vote."

A Biden spokesman confirmed to CNN that meant before the Iowa caucuses in February 2020.