can i restore my old contacts on whatsapp?????????????????

you can't restore ur contacts but you can restore your groups and old chats..

Your contacts are actively recognized from the address book on your phone. The application will automatically detect WhatsApp contacts and add them to your WhatsApp Contacts list.If you want to restore lost contacts, it is only possible for you to restore them if you have previously made a copy using your phone's features. Unfortunately, if you are unable to restore your contacts, WhatsApp cannot restore your contacts for you.

— modified on Feb 19, 2016, 8:18:43 AM

You can't restore old contacts on WhatsApp
If you have synced the contacts with Google account,you can restore them on computer.