DEAR ABBY: When I was 16 and wanted to get married, my father suggested I write to Dear Abby (your mom was writing the column back then) and ask her opinion. He said he would agree with what she said. I did, and Abby wrote me back. We did get married, and I decided that on our 25th anniversary, I would let you know how we were doing. You printed my letter. As we celebrate our 50th wedding anniversary year, I want you to know our marriage has only strengthened. A very young couple who began life together with no idea ...