2 years on coolant and about 750 miles on it.

your fine.... make sure it's good for at least 25 below
I wouldnt worry about it , just make sure it good for ur areas temps---------------
Green conventional antifreeze 50/50 mix in Chicagoland. Can I wait another year or change it before winter storage this year? 360 LA with new radiator and heater core 2 years ago.
It should be fine.