To solve this question we have to make deduct these 2 years. 2120 minus 1971 will give the answer.
You are 149 years old.
(1788 months are passed.)
From 1971 to 2120 there are 149 years. If you want to learn your age in 2120 (born in 1971) your age is 149.
Let's see what will be your age if you born +1 or -1 from that date.