Here are the ages that the top presidential candidates will be on Inauguration Day, 2021: Bernie Sanders, 79; Joe Biden, 78; Donald Trump, 74; and Elizabeth Warren, 71.

If Sanders were elected and served two terms, he would be in office until age 87. If Biden did the same, he would serve until 86. If President Trump were re-elected, he would serve until 78. If Warren served two terms, she would be 79.