How to calculate when Bitcoin mining will no longer be profitable?

In 2068, when I turn 100 years old (assuming I live as long as Yang Zhenning), the block reward for BTC will be 0.003 BTC. Based on the average inflation rate in the United States, the price of BTC will reach around 18 million per coin at that time, making the block reward approximately 60,000 USD. Considering inflation, even 60,000 USD may not be enough to cover electricity costs.

Therefore, after 2068, professional miners may exit mining. As the overall mining difficulty decreases, it will then be taken over by personal computers with idle computing power (which was also Satoshi Nakamoto's initial idea). The block reward and transaction fees will still maintain the robustness of BTC.

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