A 52-year-old man from rural Maharashtra is screened for diabetes during a health camp. He is overweight (BMI 28 kg/m²), has a family history of Type 2 DM in his father, and works as a farmer with moderate physical activity. His fasting blood glucose is 118 mg/dL. Which epidemiological feature most strongly predicts his progression to overt Type 2 Diabetes Mellitus over the next 5 years?