I started to use LaTeX about 10 years ago when I began my university studies.
These days I teach mathematics, physics, and geography in high school, and typeset all my work-related notes using LaTeX.
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for users of Mathematica
Q&A for people studying math at any level and professionals in related fields
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for peer programmer code reviews