To solve this question we have to make deduct these 2 years. 2100 minus 1963 will give the answer.
You are 137 years old.
(1644 months are passed.)
From 1963 to 2100 there are 137 years. If you want to learn your age in 2100 (born in 1963) your age is 137.
Let's see what will be your age if you born +1 or -1 from that date.