Should he win reelection and complete his full second term, President Trump will surpass Ronald Reagan as the oldest person to ever hold the office. But Trump’s age is hardly ever talked about, because leading Democrats Joe Biden and Bernie Sanders would be older than Reagan at the start of their presidencies.

As medical science improves and life expectancy increases, more and more candidates may be willing to test the limits of age. And there’s nothing in law that prevents them from running and winning. While one could argue that it should ultimately be up to the voters to decide whether somebody is fit to serve, there are clear issues with this test.

One is that the U.S. Constitution set the minimum age to be president at 35. Rep. Alexandria Ocasio-Cortez, one of the most influential voices in her party, is unable to join the two dozen other candidates seeking the party’s nomination. Even if Democratic primary voters wanted to support her, they could not. So if she can’t run simply because she’s too young, is it stripping Americans of any more of a choice by saying they could not vote for somebody who would be in their 80s during a first term?