To solve this question we have to make deduct these 2 years. 2117 minus 1957 will give the answer.
You are 160 years old.
(1920 months are passed.)
From 1957 to 2117 there are 160 years. If you want to learn your age in 2117 (born in 1957) your age is 160.
Let's see what will be your age if you born +1 or -1 from that date.