No, not my age. This:
I recently installed an under-counter microwave in our kitchen. That’s a photo of the 30″ template I was supposed to use for placing screws, drilling holes, etc. Yes, that “thirty inch” template is about 3/8″ too wide. (It was too deep as well.) Good thing (1) I’ve seen enough bad press work to know printed measurements sometimes lie; (2) I measured that sucka before I tried to install the microwave.