The new Eagle Palms requirements that went into effect on 1 August 2017 have been revised.
The revision deals with Eagle Scouts who passed their Eagle Board of Review BEFORE 1 August 2017 AND who turned 18 years old ON OR AFTER 1 August 2017. If an Eagle Scout meets both of these criteria, then he is entitled to receive Eagle Palms based on the number of merit badges he earned before his Eagle Board of Review without having to meet the "three month" requirement or any other Palms requirement.
To figure out how many Palms to award to such an Eagle Scout, you simply count up the number of merit badges earned before the Eagle Board of Review and see how many sets of five (5) there are beyond the 21 merit badges needed for Eagle. That's it. There are no other requirements.
If Palms have already been awarded for merit badges earned before the Eagle Board of Review by meeting all Palms requirements (either old or new), including the "three month" requirement, and there are merit badges left that were earned before the Eagle Board of Review but not applied to a Palm, then an additional Palm can be awarded for each set of five (5) without having to meet the "three month" requirement or any other Palms requirement.
In either case, if any merit badges earned before the Eagle Board of Review are still left, they count towards the next Palm, which must be earned by meeting all new Palms requirements, including the "three month" requirement.
All other Eagle Palms requirements that became effective on 1 August 2017 remain the same.
For details on the revised requirements, open the "Boy Scouts" page using this link, and follow the "Eagle Scout" link. These details are based on the 25 October 2017 Bryan on Scouting blog post "After hearing from volunteers, BSA to allow current Eagle Scouts to receive Eagle Palms retroactively". This post includes additional explanations of the revised requirements which you may find helpful.
NOTE: You can download the PDF which is National Council's official publication of the revised Eagle Palms requirements using this link.
New Eagle Palms Requirements
The following explanation of the new Eagle Palms requirements is taken from the 11 August 2017 SenecaDistrict.org post "Eagle Palms Requirements Changed."
Beginning on 1 August 2017, there are two ways to earn Eagle Palms. The first applies to merit badges earned before a Scout's Eagle Board of Review. The second applies to merit badges earned after a Scout's Eagle Board of Review. Each way has its own set of requirements.
What remains unchanged for both sets of requirements is that a Palm is awarded for every five (5) merit badges earned beyond the 21 merit badges needed for Eagle or the last Palm. As before, this means a Bronze Palm for five (5), a Gold Palm for ten (10), a Silver Palm for fifteen (15), and appropriate combinations of Palms for higher totals.
The only change that applies to both sets of requirements is the elimination of a board of review. Since a Palm is not a rank, it was decided by National Council that a board of review was no longer necessary.
The difference between the two sets of requirements is this: For merit badges earned before an Eagle Board of Review, there is only one (1) requirement. For merit badges earned after an Eagle Board of Review, there are five (5) requirements.
For merit badges earned before an Eagle Board of Review, you count up them up, figure out how many sets of five (5) there are beyond the 21 merit badges needed for Eagle, and award the appropriate Palms to the Scout at his Eagle Court of Honor. That's it. Nothing else needs to be done. If there are any merit badges left over, they count towards the next Palm.
For merit badges earned after an Eagle Board of Review, three requirements are the same as before: Req. 2 - Demonstrate Scout Spirit; Req. 4 - Earn five additional merit badges; and Req. 5 - Participate in a Unit Leader conference.
The two remaining requirements have been updated: Req. 1 - Be active in the Boy Scouts of America for at least three (3) months; and Req. 3 - Set a satisfactory example of accepting responsibility or demonstrating leadership ability.
Req. 1 still includes three months of activity, but a Scout is no longer limited to activity in his unit. Activity in any BSA program is acceptable, including Order of the Arrow, Venturing, camp staff, NYLT staff, NAYLE staff, etc.
Req. 3 now permits "accepting responsibility" in addition to "demonstrating leadership ability." The reasoning here is that a Scout may earn Eagle by serving only in positions of responsibility, leadership being required only when a Scout is carrying out his Eagle service project.