Memory like an elephant

I hate people who have memories like an elephant. Like "I remember 19xx in August when this and that happened". Like today. Met a friend of a friend, and we talked about the boat. Turns out he had been on it. Ok, so when he mentioned it I remembered. But not when. He goes "it was last September, the weather was nice". I like to think that too many things happen to me, and therefore my brain choose to keep what's important. Or Alzheimer light, anybody?