Hi ,im 25 ,yeah ,a bit older than your request ,but Im into manga and anime since ever ,so I think that we can understand us besides age. You can check my work on my devianart page (GinoIntroini is my username) ,my style on that artworks its a little bit more american ,but I can adapt to the request.
My favourite mangas are : Dragon ball ,naruto ,one piece ,sun ken rock ,gantz ,oyasumi punpun (all Inio asanos work) , Uzumaki ,Berserk ,and so much more.
Hope you like my offer