To solve this question we have to make deduct these 2 years. 2099 minus 1973 will give the answer.
You are 126 years old.
(1512 months are passed.)
From 1973 to 2099 there are 126 years. If you want to learn your age in 2099 (born in 1973) your age is 126.
Let's see what will be your age if you born +1 or -1 from that date.