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If not in number of years, more so in half-lifes of knowledge [0].

[0] https://en.wikipedia.org/wiki/Half-life_of_knowledge

"Very old" is subjective, some people think the Antikythera to be very old.

But when I remember developing software in my startup around 2000, the world of software development was completely different. So, hence, for me, very old.

Software is a pop culture.