What are the early signs of dementia?

My dad who's 57, for the last few months has been missing parts of a conversation. We'd be talking about subject A, then subject B, then he thinks a comment is about subject A. And it's like, did he forget what we were talking about the last minute? It happens pretty frequently. I know 57 is young for... show more My dad who's 57, for the last few months has been missing parts of a conversation. We'd be talking about subject A, then subject B, then he thinks a comment is about subject A. And it's like, did he forget what we were talking about the last minute? It happens pretty frequently. I know 57 is young for dementia. I thought it could be something else on his mind but he's sometimes an active part of "subject B" and just jumps back. He's also been angrier and meaner than usual as well.
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