Hal Mason and Karen Nadler are said to have been high school juniors at the time of the invasion. Both Drew Roy and Jessy Schram are in their mid 20s.
Margaret's age is never explicitly stated, however she is implied to be in her late teens or early 20s. Sarah Carter was 30 as of season 1.
Averted with Ben and Matt Mason, whose actors, Connor Jessup and Maxim Knight, were 16 and 11, respectively, at the start of the series.
Lourdes is said to have been a pre-med student prior to the invasion, making Seychelle Gabriel, in her early 20s, an appropriate age.
Jimmy Boland is said to be 13, as is Dylan Authors, who portrays him.
Fan Nickname: Early on for Lourdes: "God girl.", but that subplot seems to have been dropped in the second season.
Before the writers said they were called "Overlords" fans called the tall aliens "Slenders" or "Skinnies"
Life Imitates Art: In the season 2 finale "A More Perfect Union," Anne discovers she's pregnant with Tom's child - and Moon Bloodgood, who plays Anne, became pregnant for real a few months after filming that episode.