To solve this question we have to make deduct these 2 years. 2103 minus 1964 will give the answer.
You are 139 years old.
(1668 months are passed.)
From 1964 to 2103 there are 139 years. If you want to learn your age in 2103 (born in 1964) your age is 139.
Let's see what will be your age if you born +1 or -1 from that date.