To solve this question we have to make deduct these 2 years. 2111 minus 1991 will give the answer.
You are 120 years old.
(1440 months are passed.)
From 1991 to 2111 there are 120 years. If you want to learn your age in 2111 (born in 1991) your age is 120.
Let's see what will be your age if you born +1 or -1 from that date.