Why when i give my wife a compliment she usually?

If after 19 years of marriage she hasn't got used to it, there is no way she'll change. Let me tell you that you are a great men and hope she knows this because not all men like to compliment their woman and is so rare to know that there's still men like you out there. I suggest just sit down and talk to her and ask her why she always hard on herself, let her know that you love her, and tell her to be open minded and let her know that no matter how she looks you will always love her. Make her feel comfortable and I hope she gains self steam. And to you let me tell you, I don't know you but yet I admire you.