Hey, for business studies, how many years old can case studies be. My teacher said no older than 2 years but I can't really find ones that aren't at least 3-5 years old.
Generally speaking, the more recent the case study, the better. While the two-year limit set by your teacher is good, the maximum limit tends to be up to 5 years. This is based on an unofficial consensus rather than official syllabus rules.