Reply To: Getting a ride with someone from the opposite gender

Beni, the age of yichud for a boy with a woman who is bat mitzva is nine years and one day as that is when it is considered arayot. Regarding the elderly (and being that I am almost 64 I object to 65 being defined as elderly) see Yichud with an Elderly Man (online) that the determining factor is the man not the woman.
Where one of the parties is a non-Jew then the ages up to bar/bat mitzva as Jewish children under those ages and non-Jews of any age are not obligated in yichud (Yichud — What, Where And With Whom
by: Rabbi N. D. Dubov also online).