Fallout 1 & 2 had a "1950/60s vision of the future" aesthetic, from its emphasis on nuclear/atomic technology to things like the cars:
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Or the BOS helmet, which looks like spaceman helmet from 50s B-movies
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Myron dresses like a nerd from mid-century, not the 1990s (nerds in the 1990s wore Star Trek T-shirts). And note also the gigantic, heavy-looking computer equipment that looks like something out of the Apollo program. Computers were much smaller than this in the 90s. The whole aesthetic of Fallout computers and tech centers is 50s sci-fi.
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The Pip-Boy 2000 is likewise designed to be mid-century futuristic. A clunky metal device with vacuum tubes and green CRTs would only look futuristic to someone from the 50s, not the 90s. Those mechanical date/time rollers are also something completely outdated by the 90s.
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This is the kind of stuff we already had in real life when Fallout came out:
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The weapons are a mix of modern and mid-century, probably because the small arms of 1950-1965 are boring, but it is notable that they depicted the AK-112 with wooden furniture, giving it more of that classic look. By the 1990s, the Russian Federation had adopted rifles with modern polymer furniture, like the AK-74M. So this is deliberately anachronistic.
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