This is taken from HR 1125:

(c) Applicability- The provisions of subsection (a) shall not provide a basis for a claim of seniority under any labor agreement in effect between a recognized bargaining unit for pilots and an air carrier engaged in operations under part 121 of title 14, Code of Federal Regulations, that is made by a person who was a pilot and who attained 60 years of age before the effective date described in subsection (e) and is seeking a position as a pilot with such air carrier following that person's termination or cessation of employment or promotion or transfer to another position with such air carrier pursuant to section 121.383(c) of title 14, Code of Federal Regulations, as in effect on the day before the effective date described in subsection (e).

That would pretty much cover retroactivity, for any over 60 pilot. On the list, or not.

Of course, with the help of our lobbyist DW...Maybe that can be changed.