Like these sort of arguments
The equation that can be used, in this case, will deem an average for certain chips designed per architecture. All chips are different per silicon, as wafers themselves contain slightly different impurities within their design.
Standard designs specify that MOSFET Linear voltage will differ per chip.
Therefore the equation will have different values of voltage within it for the approximate same value of current.
That therefore states that the Internal MOSFETS will be operating with a slight variation of potential difference over different components to derive at the same value of current, which is a chip requirement.
Current is not exactly equal to the equation. It is approximately equal, as of course manufacturing defects can occur.
That's the first part, and no I'm not a total nerd
From a physics point of view I do not believe you can specify a half life of these devices in that manner, as they themselves are not a radioactive particle, and therefore and not under limitation by that physics law in regards to half life, they are not governed by those laws of physics. I may be wrong here however.
I will search around for the equation I specified to, of course this will be another approximately equal to equation.