Translation of jüngste

I work as an actor in the theater. I have studied English for seven years, French and Spanish for two years. Well, my level of Spanish is too low to have a good conversation, but I understand it.
On the second day we drove around Los Angeles. We were totally jet lagged (and so were our kids) and we decided to take it easy on that day. We went to Rodeo Drive as well as Beverly Hills. Both our children slept during the entire afternoon.
I understand your English, it's not bad at all. Yes, the English vocabulary is much larger than the German. The more you might spend time using the language, the better your vocabulary knowledge will become.