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Yeah, my first program was on an HP Programmable calculator, circa 1978. It did have an LED display capable of displaying alphabetic characters, but I highly doubt I would have even thought to program "Hello world."

Interestingly, Wikipedia claims the first published use of a Hello World program was in Kernighan and Ritchie's C book in 1978 (although it apparently came from a internal Bell Labs memo in 1974). I didn't even hear of Kernighan and Ritchie until I started learning C over a decade later, so yeah, I'm fairly sure my first program was not "Hello World!"