To solve this question we have to make deduct these 2 years. 2104 minus 1964 will give the answer.
You are 140 years old.
(1680 months are passed.)
From 1964 to 2104 there are 140 years. If you want to learn your age in 2104 (born in 1964) your age is 140.
Let's see what will be your age if you born +1 or -1 from that date.