To solve this question we have to make deduct these 2 years. 2100 minus 1978 will give the answer.
You are 122 years old.
(1464 months are passed.)
From 1978 to 2100 there are 122 years. If you want to learn your age in 2100 (born in 1978) your age is 122.
Let's see what will be your age if you born +1 or -1 from that date.