Good question. You are correct that as we age our ability to recover is impacted, and the duration of hard training blocks needs to be reduced.
All of our current Advanced plans follow a 3 week on 1 week off progression, while our Novice and Intermediate plans will follow a 2:1 progression. In general, we would recommend that athletes over the age of 50 stick with the 2:1 progression (so our current Novice or Intermediate Plans) unless they are highly experienced and know that a 3:1 progression is a training load they can still handle.
We can say that even though FF does not measure post-ride recovery, the fact that all workouts are tailored to your own 4DP profile makes out workouts more suited to different age groups (you can how age impacts your metris in the interactive graph on this article). For example, a standard MAP/VO2 workout in other apps usually has targets at 120% of FTP. We know as you age, your shorter duration metrics (MAP/AC/NM) will drop relative to your FTP. Meaning, a 20-year-old can have an FTP of 200, and have no problem hitting 240W for MAP intervals, whereas a 60-year-old with a 200W FTP, might struggle at 240W for the same workout. Individually tailoring the workouts does ensure that you get the correct relative training stimulus.
While not directly answering your question regarding our plans, we do have some info on training for Masters athletes that might be helpful.
And I can’t go into too much detail, but I will say that we are working on increasing the number of plans that are specifically tailored to Masters athletes in the same way plans are currently tailored to your Rider Profile.