You're a Tin-Foil Hatter (Score 1)

Yes, the average age of puberty is lower today than it was centuries ago. But it reached its current level in North America about 40 years ago, before they started pumping cattle full of hormones. The best guess is that earlier maturation isn't due to the hormones in beef, but to the beef itself. With better nutrition children grow taller and mature earlier.

Giving cattle hormones may be a Bad Thing, but not for this reason.