I still have computers and electronics from the early 1990s and before that all work fine. Likely, though, there won't be any problems. It will depend on when they were manufactured vs when the EU directive came around, and when the manufacturer switched over, etc. The computers, though, are a different thing. So - a 1974 radio is probably not going to be an issue. Technically, it can happen in virtually any tin-based alloy, but for some reason lead-based alloys with tin didn't grow them anywhere near as much or as fast. I think since then, lead-free solder has a different formulation to make it not as bad, but it still happens. Various methods and means were attempted to slow it down (the best way was complete conformal coating - but that made rework very difficult), but it took a while for manufacturers to understand what and how it was happening. That solder used more tin in the alloy than lead-based solders did, and grew "whiskers" like crazy. Tin whiskers were really only a thing with lead-free solder that was mandated in a stupid fashion by the EU (I won't go into specifics, but it really didn't make any sense once you started to look into why it was done, and the exemptions, etc).
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