I have to renew my dads passport which expired on 1993.Can I apply?
You will have to apply for re-issue of passport for your father. Since, he already had a passport, though expired, it will not come under category of new one and you will have to apply for renew. How many years back that passport has expired has no material effect on your case, meaning thereby that you will still have to apply for re-issue even if the previous passport expired 20 years back.