Is there a discount for seniors?

You can call

yes but you have to register for it..

If you are a senior citizen and a resident of New Jersey you can go into the office and get a senior citizens pass which is free and gives you full access to every state park in the state of New Jersey for free

Free now, fee starts Memorial Day and ends on Labor Day. Not sure about senior discounts.

There is a significant discount for a season pass to all of the state parks.

I would think so Marv