Where does the superstition break a mirror get 7 years of bad luck?

Answer 1

This goes back to Victorian times in England when mirrors were very expensive to produce and were, therefore very expensive to buy. They were so expensive that only the richest people could afford to have them.

In Victorian times these rich people tended to have servants and domestic staff to clean their houses, and their mirrors.

Any breakages were deducted from the domestic staff's wages and since the domestic staff tended to be quite low paid it meant that if a mirror was broken it would take the member of staff about seven years to pay for it.