p. 734: mentioned in the 1563 will of Katherine Dudley as her brother. Since she mentions Francis as her minor brother, it is assumed that Roger was at least 21 years old.
p. 733: A Roger Dudley is mentioned in the 1542 will of Edward Dudley. No relationship is indicated, so it might not have been this Roger Dudley. However, Edward asks Roger to "do deeds of charity for my soul and all Christian souls, by the counsel and oversight of Sir Henry Mote, my overseer", suggesting that Roger was a young man. Since he received goods but not property, he probably didn't have to be 21 years old.