I am getting is a single click when turning the ignition?

I have an old car and wondering if this problem is worth fixing or getting a new one. My car started just fine last night. As of this morning all I am getting is a single click when turning the ignition. From further looking into the issue I am confused if the problem is even my starter or if it’s the starter solenoid? I’m not sure if they are together or separate. I can locate the starter but not the solenoid to see what exactly I need to replace. My car still is getting juice when turning the ignition(radio, lights, wipers all work) but just a single click once I try to start the vehicle. Any help would be appreciated.

Thanks!