[FireBeyond]

https://slate.com/news-and-politics/2013/08/how-old-were-the...

"As it turns out, many Founding Fathers were younger than 40 years old in 1776 ... more than a dozen of them were 35 or younger."

Peter Salem was the youngest signatory at 16.

Alexander Hamilton, 21. Thomas Lynch, Jr, and Edward Rutledge, 26. George Walton, 27, and Thomas Heyward, Jr, 29.

[Keyframe]

Are we talking about signers of the Declaration of Independence or more broadly.. not sure what Salem has with Declaration or if he's counted as a Founding Father. I'll give you Hamilton though since he was involved and neither did George Washington nor James Madison sign the Declaration but are still counted as Founding Fathers - https://www.archives.gov/founding-docs/signers-factsheet

[FireBeyond]

I was going off of this: "An asterisk signifies that the individual was a signer of the Declaration of Independence" in my source.

That being said, I take the National Archives as a more authoritative source than a Slate article!