I had a student who started his PPL at age 70 and who was 71 when he passed his flight test (he took around 70 hrs, I do not remember the exact time).
He was one of my all time favorite students. He had wanted to learn to fly his whole life but he sacrificed his desires in favour of his family. A small inheritance and a supportive wife finally allowed him to pursue his dream. He was so excited and happy after ever flight it brightened my whole day and it sure was a pleasure to have a student who did all his homework, always showed up on time and worked his ass off. He used his PPL for 5 years of recreational flying until he decided it was time to stop flying.