Selling a home - Edison style fuse sub panel

[Sai T.]

Hello Everyone 

I’m selling a home in NJ and inspector found (I knew it). Small fuse box and buyer wants it to be replaced with circuit breaker panel. 

Almost 70 years old home. 

Am I required to replace the fuse box or grandfather rule applies ?

[Bob B.]

Finding  a licensed electrician that will do the replacement and without having to bring the entire house up to code might be difficult.