If this is in reference to programming, somebody will have to maintain the mountains of C++ that all the younger devs don't want to learn.
Personally, I'll probably be working 10-20h a week or so by 60 as consultant. Your retirement burn rate is much, much lower if you have cash coming in, even if it isn't covering all expenses.
Don't know how old you are but why do I have the feeling that by the time you're 60 the following could happen:
"The AI tool subscription we have is already trained on the mountains of existing high quality C++ code written by seasoned graybeards such as yourself, so thanks for training it, but sorry sir, your services are no longer required." "Watch this: Hey ChatGPT 9.0, fix this codebase. Done." "What we're looking for is devs experienced in the latest MonkeButt frontend framework as it just came out so there's no trained models for it yet." "Enjoy your early retirement sir" :)
They appear to be more autocomplete on steroids, then programmer replacement. It will make devs more efficient, but I doubt it will replace us.
I might start writing the most obtuse code ever so that all the models get skewed by ludicrous amounts of template nonsense, overuse of auto and tonnes of lambda functions where an ordinary function would do (or maybe many static struct with operator() to confuse matters and make the call stack obtuse). That'll guarantee job security.