Different doctors may have different opinions. My doc wants to see mine no lower than 70 but no higher than 110 but my older brothers doc told him no higher than 130. He’s on insulin and a lot of times is much higher than that so he adjusts his insulin to whatever his reading is. My younger brother doesn’t take care of himself so I have no idea what his is these days. Last time I saw him, (2004) he came to my house. He looked terrible. I took his blood sugar and it was 520. I told him to get himself to a doctor immediately. Haven’t seen him since and have no idea where he is or if he is..very sad!
Oh my goodness...you really have the experience. Thanks for all the info. So sorry about your younger brother.