Create a highly realistic 3D model of an elderly man seated in a manual wheelchair. The man appears to be around 75–85 years old, with a gentle but wise expression. His skin shows signs of aging: soft wrinkles, sun spots, and loose texture around the neck and hands. He has long, flowing white hair that is neatly middle-parted and reaches just below his shoulders. His full, long white beard is thick and slightly wavy, with a clean and groomed appearance. He has prominent cheekbones, sunken eyes, and a calm presence, possibly resembling a retired scholar or philosopher. The model should include realistic anatomy with proper scale (approximately 5’10” if standing), clean edge loops, Textures should be high-quality. The model must be in a seated pose, but rig-friendly, with clean topology