To solve this question we have to make deduct these 2 years. 2099 minus 1961 will give the answer.
You are 138 years old.
(1656 months are passed.)
From 1961 to 2099 there are 138 years. If you want to learn your age in 2099 (born in 1961) your age is 138.
Let's see what will be your age if you born +1 or -1 from that date.