La Ferrassie argues that Ancient Man matured at a much slower rate than Modern Man

La Ferrassie:

Also discovered in 1909 in France, this Neanderthal skull was determined by Dr. Jack Cuozzo to be at least 125 years of age at the time of death - and probably older.

Jack Cuozzo, Buried Alive (pg. 234-235 - 1998 edition)

Source of Image: Smithsonian Institute’s National Museum of Natural History -

Read more about Le Ferrassie here

Neanderthals aren't some less-evolved ancestor or relative of the human race. The evidence would suggest that these were nothing other than early generation Post-Flood humans. They lived longer than do we due to a whole host of factors - not the least of which is that they seemingly had a slow rate of maturation. Their skulls argue for old age. Unfortunately, evolutionary thought has mistaken Neanderthal to be another kind of human relative in the evolutionary tree.