I got engaged at 20 and some of my favorite engagement gifts were simple things, I got a few books My favorite that I give as a wedding gift for every wedding is The Five Love Languages. Also anything wedding planning is nice, they have great wedding planner momento books that allow you to save your plans in a scrapbook format. For friends that we know well and that are catholic we purchase them a weekend at Catholic Engaged Encounter. It's a great weekend getaway and a fantastic start to their marriage. Also your support that this is a good thing. 19 used to be a very common age to get married or engaged I find it incredibly sad that people don't think it will last. I've been happily married for 5 1/2 years, and I greatly respect those who supported our marriage and didn't tell us we were to young.