SIR Mick Jagger has captured the heart of an 18-year-old Argentine model after enjoying a string of dates with her while on tour in South America. Jagger, currently dating American model L'Wren Scott, broke his Lothario form by resisting the temptation to bed LULI FERNANDEZ. But the Latina, who admits she is a huge Rolling Stones fan, is smitten. She gushes, "If Mick were 30 years younger, I would marry him. "My life changed when I met him, this is going to be in my heart forever. "He is a man who could be my grandfather, and that doesn't seduce me at all. I felt very close to him without having sex."