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I used to top out at 18x when running then race training at HH saw me regularly tip over the 200 mark (3 years ago, so 35yo)
@Retro_bastard I had a Polar M600 which I compared with a H... Something... 7 maybe? strap a few times at work and they were always within a 1 or 2 bpm of each other. Averaged over an hour they were pretty spot on. GPS tracking was more reliable on the m600 than on my phone too.
I thought I knew my max hr from cycling, until I started joining in a parkrun that ends on a racetrack