To solve this question we have to make deduct these 2 years. 2100 minus 1987 will give the answer.
You are 113 years old.
(1356 months are passed.)
From 1987 to 2100 there are 113 years. If you want to learn your age in 2100 (born in 1987) your age is 113.
Let's see what will be your age if you born +1 or -1 from that date.