To solve this question we have to make deduct these 2 years. 2099 minus 1984 will give the answer.
You are 115 years old.
(1380 months are passed.)
From 1984 to 2099 there are 115 years. If you want to learn your age in 2099 (born in 1984) your age is 115.
Let's see what will be your age if you born +1 or -1 from that date.