This number isn’t exactly hard-and-fast, as the start of these things is always hazy. But.
Email is 36 years old.
Think about that for moment. I’ll wait.
This is not new technology. This isn’t even close to new.
There is no excuse, 36 years in, for not being at least familiar with this tech.
BTW: email is 41 years old if you count from the first use of the “@” symbol in an address.