SIR Mick Jagger's ex-wife and human rights campaigner Bianca Jagger is worried about losing her looks and growing old alone. The former model, 61, is facing up to her "vanity" and admits she avoids falling in love. She says, "I fear decay and decline. I am scared to grow old alone. "I love the idea of (falling in love) but I avoid it. Being able to suit yourself, not being answerable to anyone else, is very addictive. "I have friends who have been happily married for a long time, so I know it is possible and how happy it makes them. "But, yes, I avoid it. I am always travelling. I can't give time to it."