The elder of two people is the one who was born first.
his elder brother.
他的哥哥。
elders
A person's elder is someone who is older than them, especially someone quite a lot older.
They have no respect for their elders.
他们对长辈毫无敬意。
In some societies, an elder is one of the respected older people who have influence and authority.
a meeting of political figures and tribal elders.
政界要人和部族长老的一次会晤。