Announcing the decision to extend the retirement age of college-university professors from 62 to 65 years, West Bengal Chief Minister Mamata Banerjee on Monday said the move was aimed to utilise their services for a longer period.<br />''<br />''<span style="color: #222222;">Addressing the Convocation of Calcutta University, Ms Banerjee said her government has taken the decision to raise the retirement age of professors from 62 to 65 years and Vice-Chancellors from 65 to 70 years.</span><br />