'Roger and Gideon Toothaker are found on a list of witnesses to a Quaker marriage in 1767 (J. L. D., "Notes and Queries: Ancient Marriage Contract," The Maine Genealogist and Biographer 2[1876-77]:68-69, at 69). Assuming they were not minors, this would put their births earlier than what is stated in "Roger Toothaker Descendants." '
If Gideon's birth date (Feb 1751) as published in TAG 69[1994] is accurate, he would have been 16 when he witnessed the marriage, so it appears that it was not necessary that the witnesses be at least 21. However, it is unlikely that Roger would have been younger than that. This supports the idea that Roger was older than Gideon.