When will the FTSE 100 be in a Bear market?

Looking for when the FTSE 100 may enter a Bear Market. Despite the media saying a 20% drop is a signal for a Bear market, the real number is 16%.

Taking a measurement of 16% from the previous high in the summer of 2018 and a 16% drop comes to around 6442.
If price drops below this mark, (red dash line) this could signal the Bears are in full control.

Taking a measurement (purple line)from how far the FTSE dropped in the last recession and price could move to around the 4800 mark.