BMI? I take it with a pinch of salt! My usual BMI over most of my life was in the Normal range, but now is in the Overweight range? Why? As is usual at my age I have shrunk a little in height which pushes me into the higher range! I shrunk by one inch! A little change in height makes a HUGE difference in BMI! Have a play with one of the online calculators. My weight is exactly the same as it has been over the last 50 years (I am 72).
I used fat calipers to get a more meaningful result.