To solve this question we have to make deduct these 2 years. 2087 minus 1978 will give the answer.
You are 109 years old.
(1308 months are passed.)
From 1978 to 2087 there are 109 years. If you want to learn your age in 2087 (born in 1978) your age is 109.
Let's see what will be your age if you born +1 or -1 from that date.