To solve this question we have to make deduct these 2 years. 2099 minus 1977 will give the answer.
You are 122 years old.
(1464 months are passed.)
From 1977 to 2099 there are 122 years. If you want to learn your age in 2099 (born in 1977) your age is 122.
Let's see what will be your age if you born +1 or -1 from that date.