It is commonly understood that the sun, at 4.567 billion years is in it's mid-life, or about 1/2 way through it's life expectancy.
Because thats the part of its life cycle it is now in.
middle age
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I think ur a gay. when you die the sun will end on its life cycle! :D >>>Jushki
dubstep
Yes the sun technically is, this is because it causes evaporation.
It is approx half-way through its 10 billion year life cycle.