I was married before and am trying to complete paperwork regarding ex. It wants his birthdate. I don't know it, searched internet and found a month and two different years, nothing had the day of the month and I'm not even sure if what I found for month and year is correct. I think he was born in 1957. What should I put down on the form? Was married to him at age 18, I am 56 now. Thank you.