Pilots interested in the upcoming changes to the medical standards for CAT pilots over age 65 and the new regulatory guidance should click on this link:
https://www.icao.int/safety/aviation...%20Study_c.pdf
Slide 30, 31, & 32 provides more guidance on the regulatory changes for pilots flying over age 65 starting in 2020.
The Flight Time (FTL) and Flight Duty Limits (FDL) will be a reduction of the maximum monthly/yearly FTL to 80% of the maximum allowed for pilots over 65 performing multi pilot ops. For U.S. pilots operating FAR Part 121 flights with FAR Part 117 FTL & FDL limits, aviators will be permitted to fly no more than 80 block hours in a rolling 672-hour period previously introduced under FAR 117.23B1 and no more than 800 block hours per rolling year introduced under FAR 117.23B2.