If sexual attraction is so important to you now, it will still be when you are married for 20 years when your spouse may no longer be sexually attractive (since you say you are only sexually attracted to women 20 to 40 years old). There are two parts to attraction needed for a healthy marriage, according to John Paul II in Theology of the Body, sexuality and sentimentality. The lesser of the two, in a long lasting marriage, is sexuality; sentimentality is what holds the marriage together, not sexuality. In regards to your statement that you will remain married for life, unlike those who have not. What if your spouse files for divorce from you? We are a "no fault" country and there is nothing you can do about it but sign the papers. I agree with your statement that if you do divorce you will not remarry as according to scripture we are married to our spouse until death do us part. I am glad to see that you have opened up your search to include women closer to your age and hope that God puts a desire in your heart to be sexually attracted to women in that age group. Blessings to you.
Again I did not say that I was only attracted to women 20-40 years old...I said that women are most attractive in that age range...which is what I think God intended since that is the age range that women have children.