According to the fact that the physics teacher is older than the biology teacher and younger than the B teacher, it is concluded that the B teacher is the oldest, followed by the physics teacher and the youngest. Teacher A is a biology teacher because she is the youngest. This shows that Teacher B doesn't teach biology and physics.
Conclusion: Teacher B teaches Chinese and history;
Step 2: According to (3) math teacher and C love playing chess; (1) The chemistry teacher and the math teacher live together; It can be known that chemistry is taught by C;
According to (2) Teacher A is the youngest (4) The physics teacher is older than the biology teacher and younger than Teacher B; You can know: c teaches physics;
Conclusion: Chemistry and physics are taught by C;
Step 3: The rest study math and biology.