Runners, what is your target HR?

I typically don't worry about HR. Run by feel more or less.

Did one HR training program and I liked it though. PRs for 5k and 10k after a HR marathon plan.

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I keep my heart rate between 135-145 on long runs. I am 43 and can run at a 7:45 pace at that heart rate when its cool outside

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I wish. I try to stay around 160ish even for my "easy" runs . I just have a higher HR. I actually really need to test again as it's been a while. 30 minute run at "race pace", then take the average of the second 20 minutes as your lactate threshold heart rate. Then build your zones off of that. Zone 2 is 85-89% and where I do 90% of my running.

If you have specific goals or a very full training plan it's helpful. I never paid attention until doing triathlons. With so much training, it helps make sure your easy days are easy. It also shows you when you may be over-tired. If your HR is 15 BPM faster than normal on your easy run, you may need a rest day as your body is working too hard. Sometimes you don't feel that going off of perceived exertion. And for racing, you can shut down a redline before it happens.

If you run a bit, you know that feeling where everything has felt great when you started and you thought you'd be able to go forever, then suddenly, this overwhelming feeling of "I don't want to do this anymore" happens and you start talking yourself into stopping. That feeling happens around 180 BPM for me. Literally like clockwork, if I'm not paying attention and get to that point, the watch will show ~180. HR monitor helps me stay well away from that unless I really want to push it.