Jiigzz and chedapalooza have made some of the best points in this thread.
We love to believe in magic and think carbs are this negative thing. The fact is, most keto-advocates ignore the fact that a high fat diet is extremely reliable in causing Type II diabetes - more reliable than high carbs by themselves.
Also, ketosis causes some of the same metabolic disturbances that you see in Type II diabetics; it just isn't an issue because glucose supply is lowered. Ketogenic diets mimic the metabolic changes of obesity (i.e. - a switch to fat for fuel, decreased utilization of carbohydrate); but people like to brush that under the rug.
And as Chedapalooza stated, keto diets are not sustainable. There are recent studies supporting this, which makes sense to me because despite all of the people on the internet claiming they love keto diets and it's "easy to sustain" - I personally could never stick to it and I tend to eat around 100 grams of carbs a day or less a lot of the time if I just eat naturally.
In the end, caloric overload is the biggest factor.
If you really want to help your diabetes, take your medication and lose weight. Deplete your fat stores as much as possible, so that they can suck up excess blood sugar when needed, exercise and build muscle.
Also, comparing diabetes in an aging population is difficult - most people past the age of 80 show signs of prediabetes at the very least, even if they have been eating healthy. As we age, we become less efficient at utilizing carbs for energy - which means higher blood sugar.