I am a 61-year-old female who has had 2 episodes of temporary amnesia. The first was about 3 years ago, and lasted 15 minutes. The second time, I lost all my memories (eg how to read, my age, my address) for about an hour. Nobody noticed anything wrong with me either time, and I can clearly remember the experience of having no memories - it was like someone had built a brick wall between the reasoning part of my brain and the memory part.
After the second episode, I had a few memory glitches (different from my usual senior moments)