It’s most places, due to the international pressure from multinational organisations like the WIPO (World Intellectual Property Organisation) and WTO (World Trade Organisation) … they have longstanding campaigns to harmonies members national legislations to facilitate easier international trade and respect of intellectual property rights between countries…
As a result most countries (but, yes, not all countries) have the Bern convention “life plus 70”
It is life+70 only for copyrights owned by natural persons. That's why, for example, the estates of dead artists are managed by their heirs (at least in name). For copyrights owned by businesses, it's 70 years from publication.
That rule does not apply globally. Depends on where you live.