Start with ur name, then age? no! they oledy know ur outter informations as u oledy wrote on the application form b4 the interview, right? so they surely means ur personality! say sumthing that describe the good things bout u like confident, can work along with different type of ppl, can even work alone (self-independent), tolerate, responsibility, patient, willingness to learn n many more! express ur personality with feelings n not read it!
n if them ask u to descibe sumthing negatif bout urself, juz say it but not too much, ok? tomorrow i will have an interview to become a tutor (kind of my dream job) so plz wish me good luck! (same as u too!)