To solve this question we have to make deduct these 2 years. 2090 minus 1974 will give the answer.
You are 116 years old.
(1392 months are passed.)
From 1974 to 2090 there are 116 years. If you want to learn your age in 2090 (born in 1974) your age is 116.
Let's see what will be your age if you born +1 or -1 from that date.