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It's not a stereotype and it's not really a mystery. Licking or wetting your fingers for this purpose has been a standard practice across the globe, when people are dealing with turning pages (e.g. for accounting), counting tickets, coupons, paper money, etc. It was never just something older people did (except in the sense that the practice is not as common now, as people in the US and Europe don't need to do it that much anymore, due to changes like reduced use of cash, etc.). So, you might not have seen it since the need is mostly obsolete in most of the west, but it's still a thing elsewhere, and was very much a thing in the US and Europe too until a few decades back. So much so, that there were office gadgets made for this, basically a base holding a small sponge, that you would add water to, and use it to wet your fingers for counting/changing pages. They're still very much sold: https://www.amazon.com/money-counting-sponge/s?k=money+count... |
(That realization scares me, as it means I too might become an obnoxious finger-licker in a few years.)