Have the battery tested first to make sure it has full power capacity and then make sure all the connections are good, especially the side posts before condemning the starter.
Read the battery voltage while someone tries to start it to see if it drops significantly to indicate a good connection. The battery shouldn't drop below about 10v during cranking. If it doesn't drop at all, that would indicate a bad connection somewhere.
Sunday, November 8th, 2015 AT 7:23 AM