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I'm 25 and I use calc and trig all the time.

I used trig yesterday to figure out what angle I needed to cut a board (I'm building a barn).

I used calculus a few weeks ago to help solve an issue I was having with a water tank.

Hahaha, see, I'm so terrible at both measuring and cutting that I'd never expect anything I'm building to come out remotely right if I needed to start doing much with angles that aren't 90, 45, or 30, with hard pre-sets on whatever tools I'm using because if I'm setting the angle myself it's gonna be off by enough to ruin it, no matter how precise I think I've got it. No way I'm not gonna end up working around or re-doing it with something simpler if I start bringing trigonometry to the party. I'm lucky when my straight cuts that I measured and marked 3 times "just to be sure" don't somehow end up wrong.

[EDIT] actually, I take that back, I do sometimes work with odd angles but never do it without a physical template built and fitted, because attempts to do it "cute" or figure it out purely on paper have a history of being hilariously wrong (when I do them) even when the math is 100% correct (according to the evidently-not-precise-enough measurements).

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