輩

senior (at work or school)

junior (at work, school, etc.)

producing (people) in great numbers

persons of the same age

someone who is greatly one's senior

person much older than oneself (who has much more life experience)

person older than oneself (who has more life experience)

fellows

air of seniority

inexperienced person

(more) experienced mother

lowly person

young people

inferior

I

underling

to put on a patronizing air

young person

party (of people)

one's seniors and juniors

we

the aged

set

underling

lawless people

worldlings

small fry

guys

I Am a Cat (1906 novel by Natsume Soseki)

comrade

colleagues