can you have one job for the rest of your life?

Yes, I know of a few people who joined the armed forces from leaving school and stayed there until eligible for retirement.

is this supposed to be a sarcastic comment?

I am being serious, once you get a job can you stay there until you die/retire? (as some don’t get to the age of retirement hence why I said die)

You can stay there til you retire but you may be forced to retire in your 60s.

is that a bad thing? do people retire earlier than that or something?

is this supposed to be a sarcastic comment?

I am being serious, once you get a job can you stay there until you die/retire? (as some don’t get to the age of retirement hence why I said die)

title

Yes you can, but it generally isn't something you can pick and choose, it has to be the right kind of work. You can't apply for an office job or whatever, and expect or force the employer to employ you forever. But if you choose a career in something you control, ie you are self-employed, you can do that for as long as you want or are able.

All I’m saying is that you don’t normally stay at work until you die, you retire first

What exactly do you mean by one job?
One profession.
One employer.
Or one tightly defined, specific set of tasks.

Maybe, in terms of profession and possibly employer, then the traditionals of academia, medicine, the law, the church, and the military all fit the concept of 'one job for life'.
Outside of government and large institutions then the concept of a single employer for life seems to be a concept from times past - even if you don't intentionally change employer then privatisation, takeovers, company splits and rebranding does the task for you.
But job in terms of a specific set of tasks it seems unlikely that you wouldn't at least be on some sort of progression, journey, development of some sort - whether that's as in retail, vehicle maintenance, agriculture or even fine art you'll generally be learning and changing within a changing environment.
And ultimately, even if you could get 'one job for life', would you want it? With increasing healthy lifespan and later retirement age then a working life could be 50 years.

what about 0 hour contracts?

Again, you can't force the employer to keep you on a 0 hour contract. A contract is a contract, both parties can always negotiate an end to the contract, and in most cases it is inevitable that one party will at some point want to end the contract. Economics will change during your lifetime.

going a bit off topic and it might sound like a stupid question but 0 hour contracts are basically theres no guaranteed hours of work right? a bit like self employed but self employed you can control your career? does self employed jobs have contracts or not?

(I only just started working so I don’t know much).

I mean one profession.