Create a detailed portrait of Armin Arlert from 'Attack on Titan', aged 70 years old. He should have a hairstyle that mirrors the provided image: short blonde hair with a slight tousled look, parted slightly to one side, and with strands falling naturally over his forehead. Armin should have slightly thicker, more prominent eyebrows. His face should display the signs of aging, with visible wrinkles and grey streaks in his hair, but maintain a kind and gentle expression. The background should include elements that hint at his strategic mind, like a map or books, in a warm, study-like setting. His eyes should still reflect his intelligence and kindness.