There are people who are advocating that online platform should not restrict people based on their age but I think that there are some professional money making portals that would need their members to be matured.Personally I think earning online has nothing absolutely to do with your age but your knowledge and skills which can help you to achieved what you want depending on the kind of site you worked. any age is acceptable on the internet to earned if you are ready to abide by all rules of the site.