CA Pension and WEP

I am collecting a pension (Only half of it, the other half to Ex) , I am 56 years old. I have paid into Social Security for a full 20 years. SSA Online it says I have full credits with $42,500 paid by me and $43,300 paid by my employers., Medicare $31,862 paid by me and same amount paid by employer. At what age will I be eligible for full retirement and not be cut 50% for WEP?  I have an average annual income of $37,700 , with a high of $89k (age 55) and a low of $602 (age 17). Average highest of 10 years is $60K.