Plug its estimated mass (1.43 solar masses [1]) into the expression for main sequence lifetime [2] and you get ~4.1 billion years. But we don't know how old it

Plug its estimated mass (1.43 solar masses [1]) into the expression for main sequence lifetime [2] and you get ~4.1 billion years. But we don't know how old it is (the prevailing assumption seems to be it's old enough to have settled into staid middle-age behavior, making its variability harder to explain [3]). [1] https://en.wikipedia.org/wiki/KIC_8462852 https://en.wikipedia.org/wiki/KIC_8462852 [2] http://astronomy.swin.edu.au/cosmos/M/Main+Sequence+Lifetime http://astronomy.swin.edu.au/cosmos/M/Main+Sequence+Lifetime [3] http://www.americaspace.com/?p=87801 http://www.americaspace.com/?p=87801