What stage is Arcturus in?

Answer 1

Arcturus is in the latter part of a stars life. It is a red giant and it's mass is too low for it to "go" supernova. More than likely it's demise will be similar to our own Sun.

Answer 2

Arcturus is currently in the phase of its life cycle where it is a mature star, fusing hydrogen into helium in its core. It is in a stable phase known as the red giant phase, characterized by its large size and relatively cool surface temperature. Eventually, it will exhaust its nuclear fuel and evolve into a white dwarf.