While both adult men and women can start weightlifting whenever they desire, teens and children may not be permitted to participate so easily.
This is due to the theory that weight lifting can stunt the growth of children and preteens, and have other effects on their physical development that we don’t as yet fully understand.
The reality of this isn’t entirely clear and there is a lot of controversy and debate surrounding this issue. Some say there’s absolutely no proof that weightlifting before puberty can cause physical issues for children, while others worry about the hormonal and physical effects of weight lifting and what it could do to a child’s physiology.
Beyond this, there is also the safety aspect to consider.
Weightlifting gyms can be quite dangerous environments, with heavyweights and machinery being moved around a lot and under great strain and duress. While there are safeguards in place to make gyms as safe as possible, these risks multiply in severity and likelihood when you introduce teens and children to the equation.
They are obviously more fragile than adults, and thus far more likely to become seriously injured in the event of an accident. However, there is also the fact that children may be less likely to follow instructions and stick to the rules of weightlifting, which could put themselves or others at risk.
It can be difficult for young weightlifters to understand the gravity and consequences of moving around weight that is heavy compared to their own body weight, and their natural curiosity, inquisitiveness, and lack of understanding can be a dangerous combination.
In general, small children should only be allowed access to very light weights relative to their body mass, and be monitored closely if they are going to come with you to work out.
In terms of stunting growth, there are few, if any scientifically proved detrimental effects caused by weightlifting on children and teens, but the stigma is strong and doesn’t exist which makes many gyms simply refuse young gym-goers entry or usage of the weightlifting area.