4 decades separate 2020's presidential candidates. Here's what that looks like.

Jim Sergent, Ramon Padilla and George Petras, USA TODAY

Forget their policies. Age is one of the biggest differences in the 2020 presidential race. 

More than a generation separates the oldest and youngest candidates on the Democratic side. South Bend, Ind., Mayor Pete Buttigieg and Rep. Tulsi Gabbard are 40 years younger than Sen. Bernie Sanders and 39 years younger than former Vice President Joe Biden.

On the Republican side, President Donald Trump, the oldest first-term president, and former Massachusetts Gov. William Weld would also be in their mid-70s on Inauguration Day.

Of course, age has little to do with a president’s success. John F. Kennedy (the youngest elected president) and Ronald Reagan (the oldest) rank among the top 15 of U.S. presidents, according to Siena College's annual poll.

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More: The oldest, youngest presidential candidates in history

Still, age is a lens that colors our view of the world. Buttigieg and Gabbard were about 7 when the modern internet was born; Biden and Sanders were born during World War II and lived through a handful of other wars and conflicts.

Our timeline gives you a sense of just how wide the gap is between the Democratic and Republican candidates.

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This article originally appeared on USA TODAY: Presidential candidate ages: Four decades separate 2020's hopefuls