I was trying to find out when my gmail account was created and i found following soloution on google product forum.shared by Paviraad.
There is another way to find out the account creation date.
How to find out when my gmail account was created?
There is another way to find out the account creation date.
Goto Gmail Settings --> Forwading and POP/IMAP.
In the POP Download section there will be 1. Status: POP is enabled for all mail that has arrived since xx/xx/xx.
Hopefully this will be it if you have not changed your POP setting after the account creation.