Date type field conditional

I have a question about the date field and the field conditional others.

I want to put a condition on a birthday field i have on my website set as the type "Date", i want to show a description field when the user is 19 years old or older.

I tried many ways, but it's still not working,some quick help will be really appreciated.

The date field gives a date. It doesn't give age. For example it provides 0000-00-00. With that said your condition would need to be checking the date instead of for an age. Not sure this is entirely viable as you'd need to use REGEX and probably specify a list of years that are acceptable.