Age can be a factor as seeing you are looking to engage the emotions of other people, you will engage them all - as you must to get them passionate about parting with coin to do your thing.
Being “too young”, “too old”, “too male”, "too female, “too white”, “too ethnic minority”… are all factors you have to take into account. And hopefully step past so they are no longer an issue. You need to set the agenda.
So how is it that one “kid” can be seen as immature and another a wizzkid? One “old ugly dude” over the hill and another as skilled & wise? The thing is to focus on the thing you do. If you dress appropriately for your type of craft and speak with authority about the craft you will be judged more for your skill than your chest measurement.
If you are younger, avoiding the usual giveaways of the arrogant incompetent like starting sentences with the word “so” and then proceeding to write “hehe” all over the place, is a great start.
By all means, make a video if that does what you hope. Be careful that others will not just take it as you being arrogant if you just say I, I, I.
Most importantly though, know with whom you hope to do business. Clearly, I do not want to do business with kids who say “hehe” every few lines, esp if they stated something dangerously close to a fact and made themselves nervous . You may whish to serve those types of people and they may love you. In which case your whole patter may be:
so like yeah hehe i um yeah you know hehe am you know really dedicated hehe to you know to hehe making things hehe