A love interest is almost always [99.5%] at the heart of any movie. Particularly stories like this. I feel that it won't ruin the movie at all. The whole premise of the Fountain of Youth being the centre of this sc-fi adventure looks quite appealing to me. Wtahc the trailer if you haven't done so already.It looks interesting I'll have to look it up pity about the love story though most movies like this suffer because of a love interest, also you might not want to type in the yellow I had to highlight your type to read it