The most honest and pointed shares in this forum have been from younger folks. Go ahead and share salvation if you are able to show the joy of it. When we share the joy, it is truly infectious.
Actually, getting down to it, there are probably as many young folks as older folks who are qualified by the Father to teach and preach, just as there are many in each group who probably should be more careful as to what they are sharing, especially dealing with specific theologies, that is unless of course there is someone here who knows the theology the Father follows. Right, He is the Source of all that is. Starting to ramble here, so I had better watch what I say also.
As Paul advised Timothy, let no man despise your youth. If you are led by the Holy Spirit, by all means follow. One last bit of advice via Paul, when you are sharing and preaching with the Holy Spirit leading you, learn from what you say. Anyone who has experienced this knows what is being advised here.