The sad truth of advancement, you are so right, as a baby boomer I kept small notebook with addresses, phone numbers and Bday’s dates… I have to google today a lot… now where do we keep our “tons” of passwords safe, lmao 
! - And should we run out of battery or electricity, what then… we are lost souls… as you said even our phone numbers get at time a bit wiggly… 
I used to remember phone numbers of family and friends, why not anymore, you tell me, cause I do NOT get to see them (the numbers), I just click on the name or icon on a app… we are getting somehow dumber, even with calculating in head… but some folks use their fingers though, I’ve never learnt this method, I only used my brain, pen and pencil… back then there were no calculators in classroom… Calculators were at work though.
Now check the Japanese art of doing multiplication… could you do this… so complicated… 
and the Chinese seems to be easier:
