How can this be possible? A writer was fifty years old in the year 2000 but he was forty years old in the year 2010.

Question

Earlier this year, a logician friend told me a fun fact. She said, “Two days ago, I was 13 years old, but next year I will have my 16th birthday.”
When is the logician’s birthday?

Answer 1

The writer was born in 2050BC. He was fourty in 2010BC and fifty in 2000BC.

Answer 2

The years were in B.C. where the years counted down.