Running outdated themes and plugins for too long is a risk you should avoid if possible. Not every webmaster takes time to find and remove abandoned plugins on their site. Plugins such as the Vendi Abandoned Plugin Check can help. It doesn’t have any interface but runs a background task to let you know how many days has passed since each plugin was updated.
The script queries the WordPress.org servers to determine which plugin may have been abandoned. You can try it for free.