The Mayflower Compact was signed on 11 November 1620. The document with its signatories can be viewed here. Most genealogists note that if someone signed the compact he must have been 21 years old. Thus, this document is used to extrapolate ages on several Mayflower passengers. Is that statement true? Using three known ages, we can say this: Gilbert Winslow was baptized at Droitwich, Worcestershire on 29 October 1600 and he signed the compact. Henry Samson was baptized at Henlow, Bedfordshire on 15 January 1603/4 and he did not sign the compact. Neither did Joseph Rogers, baptized at Watford, Northamptonshire, on 23 January 1602/3. Technically, Winslow was but 20, Rogers was 17 and almost 18, and Samson a year younger still. In each case, these three traveled with family members. Henry's uncles, Edward and John Tilley, signed the compact as did Thomas Rogers, father of Joseph. Gilbert was the younger brother of compact signer Edward Winslow.
This is interesting because I'm trying to determine if any of the signatories were 18-21 years old. The signatories whose ages are not known at all are: John Rigsdale, John Goodman, Thomas Williams, Edmund Margesson, Richard Britteridge, George Soule, Richard Clarke, Richard Gardiner, John Allerton, Thomas English, Edward Doty, and Edward Leister. Of these only two leave known descendants: Soule and Doty.
The list of passengers who didn't sign the compact whose ages are unknown are: Robert Carter, servant of William Mullins; John Crackstone Jr., William Holbeck, servant of William White; John Langemore, servant of Christopher Martin; Joseph Mullins (son of William); Solomon Prower, stepson of Christopher Martin; Elias Story, servant of Edward Winslow; Edward Thomson, servant of William White; William Trevour, and Roger Wilder, servant to John Carver.
Assuming that servant status was instrumental in signing or not signing the compact one should note that among the signers were the following acknowledged servants: Edward Doty and Edward Leister (servants to Stephen Hopkins), John Howland, servant to John Carver, and George Soule, servant to Edward Winslow. Certainly it was age (or at least perceived age) that seemed to be the criterion.
In summary there is only one man proven not to be 21 when he signed the Mayflower Compact: Gilbert Winslow. Therefore, it is unknown whether one needed to be 21 or one needed to be 18 to sign the compact. This directly impacts the search for the English origins of two passengers who left known descendants: George Soule and Edward Doty. A full list of signers and their ages appears below the fold: