Can one recede at 15 years of age?
https://healthell.blogspot.com/2021/06/can-one-recede-at-15-years-of-age.html
Changes in the hairline can be seen here on the chare from my publication on page 318 (https://ift.tt/398ZjwM). You can see that hairlines change with age and this chart shows the important changes by age.
from BaldingBlog - Hair Loss Info https://ift.tt/2TvzxQv