Yep, it's amazing what a healthy lifestyle will do for you.  Went on a trip in a big mountain range with a group of people, including one ~90 year old woman.  The guide thought she wouldn't be able to do any of the trail walking, but she just pulled out her cane and followed right along on all but the most difficult trails.  The idea that after a certain age you can't be active is complete BS, but so many people think that way and just accept it and stop trying.