I’m 56 and have almost never gone to a doctor in my life other than in recent years for routine checkups and blood tests for prostate cancer (family history). Never been on meds (maybe antibiotics briefly once many years ago?). Lived most of my life outside the US though, and have always focused on a healthy lifestyle. I might just be genetically lucky but I’m convinced lifestyle has a lot to do with it (and not waiting to switch to a healthy lifestyle in your 40s)