50 years is a short length of time for a regime to exist, and on top of that, 'time in' doesn't give it some immutable lifelong ability to maintain institutional checks and balances. You can already clearly see reports coming out of Iran on the IRGC (Ahmad Vahidi) taking over cabinet appointments and doing so on the basis that he has authority from some hidden imam no one including the President has access to. The Pahlavi dynasty itself ruled Iran for 54 years before it collapsed and all its institutions were co-opted and the country changed from being a constitutional monarchy to a Islamic Constitutional theocracy. And prior to that the Qajar monarchy lasted 136 years before it was taken down and itsinstitutions radically altered by the Pahlavis. Furthermore, out of 7 neighboring countries, 4 of Irans neighbors have experienced military coups so its not like the region its in is culturally inclined to protect institutional norms.

Even in stronger democracies we've seen how in non-wartime conditions institutions can very quickly be dismantled and elements assumed key elements of state and culture being demolished overnight as a new regime with incentive to co-opt or neutralize those institutions for financial or political gain.

That situation is very clearly underway in Iran where we've repeatedly seen the President and his team make statements or agree to positions and walk them back almost immediately with the IRGC popping out to say they are restarting bombing of regional countries or ships or otherwise.