To solve this question we have to make deduct these 2 years. 2099 minus 1964 will give the answer.
You are 135 years old.
(1620 months are passed.)
From 1964 to 2099 there are 135 years. If you want to learn your age in 2099 (born in 1964) your age is 135.
Let's see what will be your age if you born +1 or -1 from that date.