You are a PhD and aged 64 years. So you are eligible for lecturer post with UGC scales. There will not be any problem. But when you are in a private college, they will not make you permanent and you will not get a salary in summer. As per the UGC norms you have required qualification and experience to become a professor. But as you are already crossed 60 years you may not get a post in government colleges or Universities. But private universities and colleges will take you as per their norms and scales. Whether to make you a permanent lecturer or part-time temporary lecturer is in the hands of the management of the particular college.