Is it good for a young person to use Collagen gel on there skin?

it depends on your age if you mean young young like 20- no dont you should really use it until your 30+ but it is your decision go and see a pro

Is it good for a young person to use Collagen gel on there skin?
It depends on the elesticity of the skin otherwise, the dermatologist will be in the best position to prescribe.