Plenty? I know this is by school district, but don't most places say you have to be 5 by September 1 to start kindergarten nowadays?

Me, too.
I started school in a different state, and I started first grade at age 5. Everybody in my high school class was anywhere from two weeks to two years older than me.

I started at 4 and turned 5 at the end of November. So I was a 17 year old freshman in college.

psst, ladies, I said "nowadays." None of you went to school in the last 2 or 3 years to my knowledge. :)

They just changed the rule in my school district - effective this year you have to be 5 by Aug. 31st. If they wouldn't have changed it, Mariana would be in kindergarten this year, because the old cutoff was October 16th, and her birthday is October 11th. I'm glad they changed it.

PS - I can't believe my little girl is 5 years old!

My alma mater has many 17-year-olds in its current freshman class. Just as one example.
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How to roll a blunt

In California, many freshmen are only 17 when they start college.