Photo Credit: CBS Alan Alda opens up about his battle with Parkinson’s disease. The 90-year-old spoke about the earlier symptoms of the disease, which weren’t very well known, when he first noticed it at 79. He also added how he came to terms with reality and how his medical journey is going. Alan Alda reflects on his Parkinson’s diagnosis and life at 90 In a conversation with CBS News, Alda reflected on how he had a lesser-known symptom of Park…