God I hate that graph. Do you know why it starts at 1550 and not earlier? Do you know why English people delayed marriage during the Late Medieval? Do you know *which* English people delayed marriage? Do you know why age at 1st marriage decreased during the Industrial Revolution?
"Brains don't fully mature until age 25!" is pseudoscience weaponized by feminists to justify bad behavior. It has been refuted by mainstream academics, libtard mainstream media, and it even has a Wikipedia refutation.
The concept of a "fully mature" brain is also pseudoscience. This is a complex topic so I will attempt to simplify... Brain "maturation" = neural pathways becoming stabilized, large reduction in passive neuroplasticity (automatic rewiring), pruning of weak/unused pathways, etc.