He has a growing fan base.
Harley posts his advice with the help of his dad Ben Phillips, who started using Vine in August 2013.
The Vine account started as a joint effort from Ben and his cousin Joe, but Harley's star potential took over two months ago when he one day wore an oversized shirt and told viewers of the health benefits of bananas.
Ben tells BuzzFeed: "I took the profile on as 'Ben Phillips' started doing my own vines and introduced Harley on one or two and realised everybody loved him.... Very recently we changed the name to "Ben & Harley" which I am over the moon with as we are a team!"
When he's not helping Harley make his vines, Ben manages the family business, a shoe shop in South Wales.
And while some stars of Vine are being given sponsorship deals and broadcasting work, Ben says his immediate plans are "to continue making people smile all around the world."
"It is so touching to receive messages or 'fan mail', if that's what you call it, from thousands of followers telling us we make day a brighter day every day," he says, although he wouldn't mind taking the family to New York to meet some of the big stars of Vine.