There is no automatic, fixed timeframe after which a law simply stops being followed because it hasn't been updated or looked at; and remember, we're still applying the FHS, it's in active use even if it's not updated.
Laws remain in force until they are formally:
* Repealed (abolished) by the relevant legislative body (Parliament, Congress, etc.).
* Struck down by a court as unconstitutional or otherwise invalid.
A 150 year "delete" timer would genuinely undermine the foundation of the legal system. Lawyers, judges, and businesses rely on the continuity of core laws (e.g., contract, property, and tax law). If a 150-year-old property law suddenly lapsed, it could instantly void millions of land titles and commercial contracts...
> Laws remain in force until they are formally: * Struck down by a court as unconstitutional or otherwise invalid.
False. They are still in force - they have just become unenforceable. There's a crucial difference, as the US is currently finding out: as long as they are in the books, a Supreme Court decision can instantly render them enforceable again - even against the wishes of the population.
The proper thing to do would be to "garbage collect" unenforceable laws, but politicians are (understandably) hesitant to spend political capital on it when it doesn't provide any tangible return.
There are other reasons as well. The body responsible for enforcing a particular law can choose not to enforce it, thereby rendering the law useless. Or a law can become obsolete by changes in technology or society - the original law legislates something that just doesn't happen any more, say. Laws can also be written to handle a specific event that only occurs once. Once that event has passed, the law might as well not exist. It doesn't need to be repealed because it just doesn't apply any more.
In addition, laws are typically regularly amended to handle new societal developments, to clarify wording, or to fit better with other laws or changes in attitudes. A law that has gone 150 years without being amended at all is probably a law that falls into the categories above and is obsolete.
Of course, all this is getting somewhat off-topic, but the point is that laws absolutely can become outdated and unmaintained, either deliberately or by happenstance. And the inverse is also true: most laws that people deal with regularly are kept up-to-date to ensure that they still reflect the needs and wills of the society they're being used in.
Laws remain in force until they are formally:
* Repealed (abolished) by the relevant legislative body (Parliament, Congress, etc.).
* Struck down by a court as unconstitutional or otherwise invalid.
A 150 year "delete" timer would genuinely undermine the foundation of the legal system. Lawyers, judges, and businesses rely on the continuity of core laws (e.g., contract, property, and tax law). If a 150-year-old property law suddenly lapsed, it could instantly void millions of land titles and commercial contracts...