Whether it’s a short ride or a long one, the Victoria Grandmothers for Africa always make sure it’s fun. “I’m having a blast because these women are amazing and inspirational, and I’m fitter now than I was 30 years ago!” 70-year-old Julie Holder says with a smile. “I love the exercise, but I love it even more that there’s a purpose to it, more than just exercise,” 80-year-old Kay Mulholland says. “I’ve always liked to do volunteer work of some k…