I am 55 years old and I have gum recession in a posterior tooth. Can I cover it with crown?

This is hard to answer without seeing a photo.  You will either have a crown placed there or a tissue graft to cover the area.  Schedule with a dentist for a consultation.  

Hi:Depending on the amount of gum recession you have two choices:1.  Crown2.  Soft tissue grafting to cover the root of the tooth again.Best,Dr. Maddahi