design playful illustration for a 'Retirement Activity Book' cover. The design should feature a joyful elderly woman with curly gray hair and large red glasses, sitting comfortably in a cozy living room filled with vibrant, eclectic patterns. She should be smiling while engaging in a fun activity like filling out a puzzle book or coloring. The background should include warm, homey details like a tea cup, plants, and playful, abstract patterns on the furniture and walls. The overall atmosphere should be cheerful, inviting, and full of life, with a focus on warmth and happiness."