children benefit from resistance training regardless of their age. if they haven’t reached puberty yet it's best to focus on body weight exercises such as pushups sit-ups and chin-ups. focus on proper form and technique rather than using resistance exercises with excessive weights to prevent injury. this would be a good time to meet with a strength coach or trainer for guidance on proper form. i believe the earlier the better but there really is no "age appropriate" time frame. it's about starting a new routine learning what your body can do learning and adapting to what fits into your lifestyle and slowly working towards your goals.
what age is appropriate to start a strength training routine?