I’m 70 as well and considering getting into recreational drone flying. I was a bad test taker long before I was 70 so I think it would be a waste of money to try. Will keep a keen eye on the rules nonetheless the less. That’s why I’m here, to learn.
Used the batteries multiple cycles before. Had the same scenario when I purchased the drone, updated drone to latest firmware and had to update all batteries then as well. On every power on with a other battery there was a new firmware detected...