Yes, in general they are getting on a bit by 2/3 yrs old but our oldest hybrid was a black rock who lived until she was 10 yrs old .... so still varies a lot. Have an old hybrid here now who is about 7/8 yrs old. Don't think she has laid for a few years now though
..... probably should have gone in the pot a long time ago.
I know it sounds awful but if you can only keep a few hens then keeping relatively short lived hybrids can be a good thing ..... lay really well and consistently, can live out there lives with you and you can replace them a couple at a time as needed and you have a constant supply of fresh eggs. Well .... it's one way of looking at it.