Do juvenile hairlines start at the highest crease?

I’m 19 and started to notice my hairline change about a year ago and just today was trying to measure to see if it’s in the mature hairline category, I noticed everyone says that juvenile hairlines start from the highest forehead wrinkle, and I was wondering if this is always true because I have a picture of myself from when I was 10 or 11 with my hair slicked back so you can see my...

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