Would like to solicit information from 65+ riders.

The thread in 50+ about typical power and speed of cyclists lists info that has been discredited by all those responding.
From your personal experience is this Bike Speed by Age chart correct? - Bike Forums
Most commented on their speed, which for my suburban road riding is meaningless from a performance perspective.

Everyone here knows I refrain from collecting&recording data. I have never used a power meter. BUT, my daughter/SiL bought a NordicTrack indoor cycle system. So curiosity got the best of me. How many watts can/do I generate? And what might be my FTP?

3rd time on the NordicTrack, I was confident that the position, saddle, bars, etc were good enough for a 1 hour ride. Having never done a full hour 'power ride', chose to start easy for 20 min (~230watts), then eval & adjust effort. The final result was 248 watts averaged for 20.5 miles. I chose a 2% grade and regulated the resistance to keep cadence between 70-80 for the most part.

At the end, I was sweating and breathing hard but not totally exhausted. So maybe a stronger ride was possible, but not by much. Maybe some carbs instead of just water might help.

How does an FTP of 248 watts over an hour stack up against other 65+ers?

For reference - 70yo, 195 pounds, 35 year cyclist, probably averaging 3000mi/yr over the last 5 years.