oldhands

noun
UK /ˌəʊld ˈhændz/
US /ˌoʊld ˈhændz/

People who have done something for a long time and know it very well.

The old hands at the factory showed the new workers how to use the machines.


OTHER MEANINGS

2. Experienced sailors on a ship.

The old hands knew the storm was coming before the captain did.

3. People who are very familiar with a place or group.

She's one of the old hands here, so ask her where everything is.

4. Skilled players in a game or sport.

The old hands on the team helped the rookies learn the plays.