The GOTY guide for the first Redemption states that, as of 1911, Bill is 29 years old and Dutch is 45 years old (thus meaning that Bill would be 17 years old in RDR 2 and Dutch would be 33). For so many reasons, both of these ages are inconceivable and not workable, so they shouldn't be considered correct.

It seems to be the common narrative - on here and other places online - that Dutch was born in 1855 and Bill was born in 1866. These dates of birth make much more sense and, perhaps as a result, have been accepted by many fans. Including myself, for a long time.

However, does anyone know where these birthdates (1855 for Dutch, 1866 for Bill) actually come from?