At the start of his career, Lloyd Davis drew a circle on a map, showing everything within 200 miles of his hometown in Kentucky. It was 1964, and he was looking for his first teaching job. He found it 150 miles away in Virginia, making $4,600 a year. Last month at the Lancaster High School Career Center, he started his 54th year in the classroom. “I’m not ready to give it up,” said the 75-year-old drafting teacher.