The African is my brother but he is my younger brother by several centuries.
My husband and I had to raise five of my younger brothers and sisters. They lived with us. We sent them to school.
Travel, in the younger sort, is a part of education; in the elder, a part of experience.
I read a bit of Ray Bradbury when I was a younger man. I don't read a lot of fiction anymore... like, none.
Younger scientists are extremely sensitive to the moral implications of all they do.