If this is the slide deck you’re referring to:

https://www.icao.int/safety/aviation...%20Study_c.pdf

In my opinion, as you state, these slides do indicate ICAO is looking at ways to mitigate threats due to expected age increases in the pilot age limitation. ICAO does predict the retirement age will increase to 68 by 2030. (Slide 8) This is the result of increasing life expectancy in member states.