I know there is no alternative apart from retinal recognition or saliva swabs or whatever but.........
A few months ago I had my email account hacked into and changed my Ebay and Amazon details. Tonight I was trying to remember my passwords to order Christmas presents.
I worked out how many pin codes and passwords I have:
Three separate bank accounts and three separate pin codes and log in passwords. Personal.
Two business pin codes and passwords
Amazon - password with letters and numbers
Ebay - password with letters and numbers
A login password for my mobile phone - a mix of numbers and letters.
Pin number for the alarm system at work.
Another pin number for another door at work.
Pin number for the credit card terminal to log in
Another pin number to verify to credit card terminal
I am fecking dizzy with it all, but you are advised to not use the same PIN code or password!