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I think all three of those things came to domestic ubiquity around the same time - late 60s to early 80s.

But microwaves are the only one you'll still find in most homes. I think GP was implying that the author is relatively young.

I think microwaves didn't commonly have a clock in the 60s

They certainly had a timer though.

Mechanical in the earliest units.

Yes, a spring loaded dial that always went back to 0. No clocks.