How many people are 65 years old in Luxembourg?
"How many years have you?" is a direct translation of the Spanish question "Cuantos años tiene [usted]". It really means "How old are you?" The answer to the question is your age. I am __ years old. Tengo __ años (I have __ years) Be sure to use an ñ and not just an n in the word año[s] otherwise you are telling people how many anuses you have, not how old you are.
The old city of luxembourg for starters... Then there is the Fort Thüngen, the Adolphe bridge, Luxembourg city hall, the Gothic revival cathedral of Notre Dame, the Grand Ducal Palace, the Place d'Armes and the Luxembourg Castle. (And this is just in the city of Luxembourg. Might be more to see in the country of luxembourg)