To solve this question we have to make deduct these 2 years. 2120 minus 1983 will give the answer.
You are 137 years old.
(1644 months are passed.)
From 1983 to 2120 there are 137 years. If you want to learn your age in 2120 (born in 1983) your age is 137.
Let's see what will be your age if you born +1 or -1 from that date.