comrade, fellow, people, companions
輩 centers on a group of people who share a common bond or status: comrades, fellows, companions, or people of the same kind.
輩 combines 非 (likely a phonetic element) with 車 (vehicle), suggesting a group of vehicles or a rank of people traveling together. The exact historical development is uncertain.
A line of 車 (vehicles) arranged in a 非 (row) represents a group of comrades or fellows traveling together.
For ハイ, imagine a group of comrades shouting 'Hi!' to each other as they ride in their vehicles: Hi -> ハイ.
senior (at school, work, etc.); superior; elder; older person; predecessor
junior (at work, school, etc.); younger people; younger student
party (of people); set (of people); clan; family; fellow
producing (people) in great numbers; appearing one after the other
I; me; myself
young person; youngster
fellows; comrade; colleague; one's equal
inferior; low-class person
lawless people; gang; malcontents; recalcitrants
person older than oneself (who has more life experience)
person much older than oneself (who has much more life experience)
we; us
worldlings; the crowd
colleagues; fellows; comrades
(more) experienced mother
one's seniors and juniors
air of seniority; patronizing attitude
to put on a patronizing air
persons of the same age
I Am a Cat (1906 novel by Natsume Soseki)