Mayan Gender prediction!

ok so I've used this on my mom and all hers was right and I did it for my baby I'm with now and it gave me girl. Is this right for yall? (Does not work for multiples)

Take the year you conceived example mines 2018 witch is an even number and my age is an even number so that means girl.

if the year you conceived and how old you are both are even or both or odd that means girl. If one is even and the other is odd that means boy. What did tall get? is it correct for your past children or what did you get for the babys gender prediction?