This is related to seniority. When your carreer proves your worth and your wits, people stop asking at what age you started speaking, at what age you stopped pooping your pants, when you learned to read and write, what your SAT scores are (or whatever the equivalent is at your country) and finally which college you went to. Then they stop asking (but are still impressed by) the places you worked at, the projects you worked at and they finally let you off the hook when there is nothing else to prove.