I am trying to establish the age of....
 

my Blizzak tires that I bought used. Could somebody tell me how old they are?
I think that these numbers are the ones : 0230677
Other numbers are :
P0701
CLH2209
Any ideas?

The week and year the tire was produced is defined by the last four digits of the Tire Identification Number (2 digits to identify the week followed by 2 digits to identify the year).

Based on the info provided, your tires were most likely manufactued the 22nd week of 2009.