Stop in for a cup of coffee

Sublime one said

So question to all you mid sixties (or more) gym rats out there. As a result of a lifetime of (serious not hobby) lifting weights and the subsequent joint replacements in my mid sixties I find myself migrating to more and more cardio. I am still lifting very regularly but more for range of motion than actual weight. Example: work sets on bench are just under 150 pounds, leg press sled same weight basically. Two plates and some dimes. I am getting bored. All my cardio was always on the ice, skating my nuts off playing hockey so never really focused on stationary bike as a result of skating 2-3 times per week. I find myself now perched on a stationary bike thinking to myself what is a good distance? What is a good cardio sustained HB for a guy my age? Any input gym rats?
@ZMan67S @WV64Signet @MOPARMITCH

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I actually use a lot of HIIT for cardio...
I'm "Team Bowflex" so that's where I get a lot of it from.

HVT will have me hit muscle failure in 18 - 20 minutes.

Max Trainer is a good whole- body cardio experience... "The Machine" to steal from The Princess Bride. Instructor led or profile workouts. Sprint/upper body work

I have a Bowflex Velocore bike... with a 16" screen. Allows for instructor led or ride programs... pick music and accompanying video. Requires subscription, but we'll worth it compared to staring at a blank wall. I use this for endurance... max VO2

Currently I'm at about 180 bpm max... low/resting around 56 bpm. I shoot for 130 - 140 for aerobic work.

I'm conscious of knee stains/ stress. The bike is most friendly... Max Trainer second... HVT can get stressed with some of the jumping or lunging exercises (speed of reps is very high).

I've tried rowing but for me the low back/knee stress was a non-starter.

I use a Polar H10 chest strap due to its compatibility with the machines and smart watches