To solve this question we have to make deduct these 2 years. 2090 minus 1977 will give the answer.
You are 113 years old.
(1356 months are passed.)
From 1977 to 2090 there are 113 years. If you want to learn your age in 2090 (born in 1977) your age is 113.
Let's see what will be your age if you born +1 or -1 from that date.