To solve this question we have to make deduct these 2 years. 2098 minus 1978 will give the answer.
You are 120 years old.
(1440 months are passed.)
From 1978 to 2098 there are 120 years. If you want to learn your age in 2098 (born in 1978) your age is 120.
Let's see what will be your age if you born +1 or -1 from that date.