As an exercise nerd, I geek out on all this physiological stuff.
But the raw reality, at my age the task is much simpler. What is a heart rate where sustainable cardiovascular gains can be made, without injury or compromising successful adaptations? (For me - 73 year old male with a long history of training - probably a heart rate of 85 to 115 for almost all of my exercise. And by all of my exercise, I mean every 4 of five training sessions.)
The next question in my geriatric simplification would be: What is the heart rate that will sustainably yield speed for some racing, power for some climbing, or maintenance of max VO2? (For me, that probably means a pulse of 125-140 for a small portion - say 10% - of my exercise, or about a portion of one or two training sessions every week.)
So, I won't be measuring lactates, I probably don't need that super-slick Coros Apex 2 Pro watch, because at my age, training isn't rocket science. Maybe it's heretical to say, but at any age or level of athletic performance … it ain't rocket science!
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