If somebody went to med school, law school, or got a PhD, then they would probably be doing well to get to a net worth of ZERO by that point.
Getting to $300k net worth by 30 would probably be considered "great" based on prior threads on this board.
Here is an interesting blog post that theoretically suggests "the average net worth of the above average person" as $240k at 30. LINK
. I would consider that number to be way more than just "good".
I would think almost anyone could have $100k by 30 if they started a career around age 21 or before and were somewhat diligent in their finances (or super diligent with a low income).