Is it normal to have moments where your mind goes blank?

It's been there my whole life. I'm not worried about it just curious. I'll randomly get this moments where I cannot form a single thought and sometimes I'll stare off into the distance and it can be hard to snap out of. It'll only last a few seconds though and I'm fully conscious the whole time. A lot of the time it happens mid conversation and I'll completely lose my train of thought and forget what I was even talking about.