How long should I expect my hens to live?

[Nats Chickens]

I have 3 Bond browns and 1 Bond black. Should I expect them to only live 2-3 years? [They hatched on the 9th of May this year]
http://www.bondsbackyardlayers.com.au/information

I also have 2 RIRXAustralorps and 2 RIWXLeghorns. How long should I expect them to live? [3 will be 2 in December, and 1 will be 2 in January]
Thank you!

 

[NoFlyBackFarm]

I’ve heard of some living 15 years!

 

[Nats Chickens]

What? ISA Brown types?

 

[NoFlyBackFarm]

Any! I have an eight year old that still goes broody!

 

[SongBaby33]

I would expect them to live around 5 or 6 years

 

[Mrs. K]

well I would expect 3 years, and then anything beyond that is bonus. If you really want them to live that long.

Personally, I keep a flock, birds move in and out of the flock.