Ashot, -what, no flowers?
At my first glance at your post i thought you were planning a seduction rather than a meal. I wanted to give you my recipes for Lady Chatterly's Chowder plus Scampi in Love as your main.
Here's my observations, you appear to be thinking more about yourself than your guest, often a fatal flaw in relationship building. Why ask we strangers to plan your menu and not your guest? Does she have any dietary restrictions? What foods does she particularly enjoy? Why not ask?
Do you care?
And what does age have to do with this meal? Is this more about you?
May i suggest you two agree in advance on something that she likes and you feel competent cooking. Incompetence isn't impressive. Pick something that can be prepared in advance. Nothing too labour intensive, so she gets more of your attention than your stove. Chose sides that can be made in advance too. Consider making just the main course and buying everything else. If you are comfortable she likely will be too. She's coming to meet you, not for a culinary extravaganza.
I get the sense you don't entertain often. That's OK, you just need to do some extra planning. Start by making a detailed Things-to-Do list. Everything goes on the list, like get rid of all clutter, thoroughly clean the bathroom and everywhere she might see, particularly the kitchen. Set the table with everything that might be needed so you are not jumping up and down during the meal. Heat the plates that will have hot food, chill the plates that will have cold food.
Plan everything, keep it simple, and enjoy.