According to your strava you usually do less than 100 mile weeks, which could possibly account for the redlining earlier. As for the heart, everyone's is different. It's really hard to say without going to see a doctor. I have a pretty high heart rate for my age compared to a lot of people I know. I can be cruising in z1 power and be at 140 HR (Resting ~ 55, max ~ 197). One of my teammates last year could be doing threshold at 135bpm. My mom is even worse than me, she can just ride her bike and be over 160 (and her max is no where near as high as mine). She went to the Doctor and they couldn't really find anything wrong, but I do know she started taking some meds and it lowers it considerably for the same RPE, and she seems to be doing better.
If you are really worried, I would take a trip to the doc.