Lifting weights at this age is SAFE! Want some research go read on it? Check out these papers: Faigenbaum AD, & Myer GD. Resistance training among young athletes: safety, efficacy and injury prevention effects. Br J Sports Med. 2010 Jan;44(1):56-63. Byrd R, Pierce K, Reilly L, Brady J. Young weightlifters’ performance across time. Sports Biomechanics. 2003;2:133-140 (IG: imjulius)