Saturns fact of the day #2: if you eat Oxi Clean Kaboom and drink a bit of bleach you'll get to see Billie Mays
When you chop down a tree you can check how old it was before you brutally killed it by counting the rings on the stump.
In a similar way yes. When you kill a human you can check how old they were before they died by subtracting current year with their date of birth on their ID.
