When Outlander began filming in 2013, Sam Heughan and Caitríona Balfe were older than the roles they played, but now, as the second half of Season 7 unfolds, Jamie and Claire have aged.

In 2014, Balfe first came onto the scene as Claire and the character she’s brought to life has been beloved for over a decade—by both viewers and the actress herself. “For me, Claire is such ...