My 2011 mazda 6 won't start but all the lights come on, it just clicks when I try to turn it over. Any ideas?

 

Auto? Manual?

Have you tried jump starting it?

is the red immobiliser light off or flashing?

 

I'm pretty sure it's the battery, when I went out this morning all the lights are dimming and the gauges aren't as wild...it's an automatic and I have someone coming later today who can try to jump it. I popped the hood and discovered it's the original battery which is about 4 years old...it's my wife's car