To solve this question we have to make deduct these 2 years. 2109 minus 1974 will give the answer.
You are 135 years old.
(1620 months are passed.)
From 1974 to 2109 there are 135 years. If you want to learn your age in 2109 (born in 1974) your age is 135.
Let's see what will be your age if you born +1 or -1 from that date.