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Me too. I don't do Crossfit anymore because of the back and joint pain that comes from lifting too much weight, but I include HIIT in my bikes rides (hill work does it) and rowing.

When I do an indoor row, I mix in HIIT by getting off the rower even 2,000 meters and doing thrusters and/or squats with moderate weights.

Not only are my workouts more fun and more envigorating, but it seems like I am just more fit.

I am 74 and still bike and row at the same or better level of performance I achieved when I was 35. I even have speed records on a certain local hill (killer hill) from 40 years ago and I am slightly fast now. My record time on that hill was established 2 years ago and I am shooting to break that record. I use a Garmin computer now vs a Pulsar (I think--have had many) back then and ride a Trek Madone now vs a Specialized Allez (I think), but that shouldn't account for too much of a difference in speed.