I'm 45, male, european. i hike 40 miles a week. my egfr is 72 (98umol/l or 1.1mg/dl). is this low for my age? what gfr range is expected at my age?

EGFR range: You realize that in the egfr the "e" stands for estimated. It is arrived at by taking the patient's age, sex, race, weight and serum creatinine level and putting those data into a formula. To get your "actual" GFR (a) is, see a nephrologist (n) and have a 24 hour urine collected for a creatinine clearance which will give it to you. Once you get a, your n can tell you how good or bad your a is.