At 17, Mary Cain just ran a 4:24 mile. If trained properly, she could have anywhere from 8-10 more years of speed races left in her. Seeing how Galen could potentially get the indoor mile world record at the age of 27, is there a possibility that Mary could drop 25 seconds and be the first female under the 4 minute barrier by the time she's 27? Alberto clearly knows how to keep his athletes from plateauing (He's been training Galen since HS).
Thoughts?