I'm about 37 so I came after slide rules died off. I still like them, cool idea, lacking in precision in today's world but still likely good enough for a large number of tasks. When I see one cheap at a fleamarket/hamfest I will buy it. I have two or three now I think, and a manual or two.
I know the mechanics behind it, but have never take the time to master it. I know two of the scales but the rest... not so much. Sine, cosine, etc. What I usually do is first do a calculation that I know the result to, that way I know I'm on the right scales. But by then it would have been faster to either get a calculator or do it by hand!