Want to feel old? Excel just entered its 40th year
theregister.com
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Also a technical achievement for the history books (in the DOS era, Lotus 1-2-3 truly pushed the envelope and was the reason for early 'extended memory' standards, but on both Mac and Windows, Excel truly shined, allowing much larger sheets than were possible before, despite the meager hardware resources available).
Also, a true source of feature innovation. 'Autofill', first seen in 1992, was possibly the first 'AI' (and yeah I know), and even the features that were absolutely useless (like the ability to modify sheet values by manipulating a graph, introduced in Office 95, which I remember demo-ing to great applause during the European intro tour) made a mark, as did the UI.
Of all the current 'Office'-style apps, Excel is the only one that is probably still irreplaceable for me. And yeah, I know, it messes up CSV imports by default, which has reportedly set back DNA research by hundreds of years, but that's just a matter of teaching future scientists to use Data/From Text-or-CSV as intended, and will thus sort itself out within the lifetime of this very useful product...
There is hardly anything useful you can do with computers that you can't do in Excel. Spreadsheets are a higher level abstraction to computation itself.
Like to live the bloody data alone and not transform it into a date and then to use black magic to turn it back ? /s
So Excel is quite a bit easier.