How old is Grandfather?

Question

This position has been used in hundreds of chess problems for various reasons by a plethora of problemists over many, many decades. It is known as "Vielväterstellung" in German, or "The Grandfather Position" as I know it in English.

However, how old is Grandfather? Find the fastest possible proof game to reach this position. The first answerer to provide proof of optimality receives the checkmark. Good luck!

Albert.Lang · Answer

UPDATE:

This might be optimal but it is difficult to be sure.

Obviously, (1) and (2/3) are not mutually exclusive

Calculating an exact minimum is difficult because

end of UPDATE
I'll get the ball rolling:

No proof of optimality because I doubt this is optimal.

Joel Rondeau · Answer

I started with a different tactic than the first answer and made it to the same result, but between studying his and tweaking mine, I have now managed

The game:

General comments on strategy and whether it's optimal...

How old is Grandfather?

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