I have never been asked to show my ID ever in my entire life when buying alcohol.

The alcohol age limit equivalent would be to put the entire TPM + proprietary software infrastructure into the cash register, locking in a monopoly on what software can be used on cash registers. Not to mention, you now have to scan your ID, which then obviously gets recorded forever, allowing the government to track your alcohol consumption.

Yeah, I'm against that and I don't even drink alcohol, not even the alcohol I've bought myself as a gift to my parents.