The question asks "how" not "how has it gone?" only I know that [thinking quickly] not "how much have you learnt?" [never enough] it asks "how much has passed?"
as if what's gone by has died and it hasn't it's the opposite it's been so alive with everything I am all that we are it's unfortunate that the majority of it misplaced absent minded has somehow gone blank when I try to remember it
so I answer 13.798±0.037 billion years the same as you or we wouldn't be here
it's just that recently the old bit has had a special quality for us both
and I'm stared at not absent mindedly but blankly as in stark staring