How long do you keep paperwork

I once read that you are supposed to keep anything tax related for seven years, and estate/ Probate docs for 20 years! House docs- for ever, or until you sell/ die.

Recently I was involved in a financial transaction and had to go through the checks for money laundering. A couple of years ago I moved some money to a new account and the closed old one. Unfortunately I had a paper clear out and shredded the old statements.
The money laundering check required the old account statements, which of course were not available on my banking App. Fortunately I could get to a main bank branch. Even so, they could only access the last statement to print off for me.
Lesson learned, do not shred anything that you can’t access on line.