By Sam Elliott-Gibbs Aaron Taylor-Johnson called Sam Taylor-Johnson his soulmate as he celebrated her 57th birthday with a loved up message. The actor, 33, and director Sam have been together for almost 15 years now now, after having met when working on the film Nowhere Boy in 2009. The relationship has attracted much attention over the years, including remarks over their age gap but he refuses to shy away on social media. As his wife marked her big day, he uploaded a gushing post with a sweet black and white photo of them in each other’s arms. He wrote a cute Instagram tribute to her, reading…