But you're still miles ahead of the average 60 y/o these days, who's on a half-dozen daily meds and has not worked up a sweat from exercise even once in the past 5-10 years.
And I do agree that low-intensity rides are not doing very much good, even if the person spends all day on the bike and covers some otherwise-impressive distances. High intensity workouts, I believe, are where you get the most health benefit, and the best "training effect" that will allow improvements in fitness to occur. A 10 minute ride at 90% effort will yield far more health benefit than an all-day ride done at low intensity where the rider is never out of breath and barely breaks a sweat, IMO.