There's no particular timeline that stands true for all patients, it depends on many factors such as age of diabetes onset, control of blood sugars, lifestyle and regular check ups.
Pre diabetes has been linked with long-term damage including to your heart, blood vessels and kidneys, even if you haven't progressed to type 2 diabetes. Prediabetes is also linked to unrecognized (silent) heart attacks.
Irrespective of type 1 or 2, Diabetes can be inherited and is linked to your family history and genetics but environmental factors also play a role. Not everyone with a family history of diabetes will get it, but you're more likely to develop it if a parent or sibling has it.
Physical exercise lowers blood glucose levels and blood pressure, improves blood flow, burns extra calories so you can keep your weight down if needed, improves your mood, can prevent falls and improve memory in older adults, may help you sleep better. Start exercising after speaking to a doctor, start slowly and increase. Few types are walking briskly or hiking, climbing stairs, swimming or a water-aerobics class, dancing, riding a bicycle or a stationary bicycle, taking an exercise class, playing basketball, tennis, or other sports