Age of Tire (How old is tire?). Most everyone knows this but just in case some don't.

Check the sidewall for the date stamp, a four-digit code inside a rectangular box.
These indicate the week of the year, and then the year, that your tire first popped
out of the mold. So a date stamp of “4012” would read as “the 40th week of 2012,”
or some time in early October of 2012.

Prior to 2000, it was a 3-digit code: 2-digit week + year of that decade.
Example "408" would be the 40th week of 1998 (or maybe 1997).

BTW, it's common for a new motorcycle to have 18-month old tires.