If you can live up to 80 years old, assumingly don't get any genetec adjustments or have your body frozen, and survive through maybe a few more financial crises, social revolutions, artificial intelligent impact, cancers, epidemics, then...
the amount of time you have left is:
~55 years OR
~660 months OR
~20059 days
Oh maybe minus the last 10 useless weak-ass years of your life as well, now you have
~45 years OR
~540 months OR
~16406 days left.
Through this new len of looking at life expectancy, I hope you now think about your life a bit differently.
Can I make you feel worse? Try with your parent's DoB.