To solve this question we have to make deduct these 2 years. 2120 minus 1964 will give the answer.
You are 156 years old.
(1872 months are passed.)
From 1964 to 2120 there are 156 years. If you want to learn your age in 2120 (born in 1964) your age is 156.
Let's see what will be your age if you born +1 or -1 from that date.