To solve this question we have to make deduct these 2 years. 2090 minus 1970 will give the answer.
You are 120 years old.
(1440 months are passed.)
From 1970 to 2090 there are 120 years. If you want to learn your age in 2090 (born in 1970) your age is 120.
Let's see what will be your age if you born +1 or -1 from that date.