you don't need to open the lid for it to go bad
and no brake fluid is good for life its a fact
dot 5 fluid has a higher boiling point nad can;t be mixed with 3-4 as it is silicone based ,eve though it is better it still needs to be changed and also more frequently
so their is NO modern day brake fluid that is infinite just a matter of its physics it is hydroscopic and attracts air which lowers its boiling point and pedal stiffness