To solve this question we have to make deduct these 2 years. 2091 minus 1951 will give the answer.
You are 140 years old.
(1680 months are passed.)
From 1951 to 2091 there are 140 years. If you want to learn your age in 2091 (born in 1951) your age is 140.
Let's see what will be your age if you born +1 or -1 from that date.