An example of an elder is a 95 year old man.
An example of elder used as an adjective is in the phrase "the elder member of the family," which means the oldest member of the family.
Respect your elders.
After being a member of the Church for a while, Bill was ordained to the office of elder.
Jack had been an elder for only a few days when he received a new calling.
The elders are coming over for dinner tonight.
One of the long-time leaders in the Church is Elder Packer.