Is it normal that I can’t sleep more than 8 hours straight as an adult?

I normally sleep 6/7 hours without waking up and that's usually enough for me to feel fresh. Occasionally if I'm exhausted I may sleep 8 hours without waking up. I'm always impressed when adults tell me they can sleep 12/14H straight. I honestly don't remember ever sleeping for that long even as a kid.

Is it normal that I can’t sleep more than 8 hours straight as an adult?
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