To solve this question we have to make deduct these 2 years. 2120 minus 1981 will give the answer.
You are 139 years old.
(1668 months are passed.)
From 1981 to 2120 there are 139 years. If you want to learn your age in 2120 (born in 1981) your age is 139.
Let's see what will be your age if you born +1 or -1 from that date.