[O0OITSTIFFANYY]

Math help needed! Please help!!

My grandson, my son, and I share the same birthday. This year I remarked to my son, "You know, of course, that today all three of our ages have become prime numbers. But did you realize that for the last 17 years prior to this year, whenever your age was a prime number, so was mine, and vice versa?"

"Yes," he replied. "And 17 years form now, I will say to my son, 'You know, for the last 18 years prior to this year, whenvere your age was a prime number, so was mine, and vice versa.'"

How old are you?

(Show or explain your procedure along with your answer.)

Thank you in advance!

[O0OITSTIFFANYY]

someone please help! T-T