This old man still held the most seniority in the Renault family. Despite having stepped down from power quite some time ago, all his glory and titles still remained, and people treated him as such. Nowadays, he was no longer involved with the government, but people still respectfully acknowledge him as "Old General Renault."
As one aged, one's bodily functions deteriorated. Ever since Old General Renault had stepped down, the amount of idle time made it easy to ponder. He thought about his family, wistfully remembered his late wife, and reminisced about his old comrades-in-arms.
That was not a beneficial situation, and thus his doctor had recommended that he should head out more for some fresh air. Staying at home made it easy for him to overthink, which was not necessarily a good thing for someone his age.