Originally Posted by
Aahz
I tried to track down the ages of the Fox Kids did I miss anything?
Tim/Jace Fox
The Earth One version of Tim was collage student [1] which indicates that he was around the same age as Dick Grayson.
In the Post-Crisis continuity Lucius Fox is shown to have a teenaged son in a single issue [2], his name was mentioned, but the appearance are usually attributed to Tim since Luke hadn’t been created at this point.
Jace, the version of Tim who was reintroduced in Infinite Frontier, was established to be the oldest of the children of Lucius Fox [3]. It is only said that he was 17 when he commited the hit and run accident [4], but his current age was never established.
Sources: [1] Batman #313, [2] Gotham Knights #32, [3] The Next Batman - Second Son #8, [3] The Next Batman - Second Son #8
Luke Fox
Luke Fox appeared for the first time in the new 52, in earlier continuities the name Lucius Fox son was Timothy. He was said to be 23 when he became Batwing [1] after graduating from the MIT [2]. So he is two years older than Dick and Barbara.
Sources: [1] Batwing #20, [2] Batwing #19
Tiffany Fox
The Earth One version of Tiffany was the oldest child of Lucious Fox and already an adult working for the Wayne Foundation Ghetto Drug Rehabilitation Programm when she was introduced [1].
In the Post-Crisis continuity Lucius Fox was initially shown to have a teenage daughter in several issues [2-4], who would be roughly at the same age as Tim Drake. Her name was never mentioned, but the appearances are usually attributed to Tiffany since Tam hadn’t been created at this point.
The adult version of Tiffany was reintroduced shortly before Flashpoint as Tam older sister [5] who became the head of the Wayne Foundations Social Services Division [6].
In the new 52 Tiffany was 6 [7,8] or 7 [9,10] and the youngest child of Lucious Fox. While in Infinite Frontire she suddenly was aged up to 13 [11].
Sources: [1] Batman #308, [2] Detective Comics #658, [3] Robin #14, [4] Gotham Knights #32, [5] Red Robin #5, [6] Red Robin #14, [7] Batwing #31, [8] Batwing #34, [9] Batwing #21, [10] Batwing #30, [11] The Next Batman - Second Son #5
Tam Fox
When Tam was introduced shortly before Flashpoint it was said that she was 19 [1] and in collage [2], which made her 2 years older than Tim Drake.
The age of the new 52 version was never mentioned. But during Rebirth it was said that she had put her batchelor on hold (which would put her in her late teens or early twenties) to act as CEO in Lukes company [3], and that she is 6 years younger than Luke [4]. This is contradicted by a flashback that shows her to be relatively close in age to her brother Tim/Jace [5], who is established to be older than Luke.
Sources: [1] Red Robin #11, [2] Red Robin #16, [3] Detective Comics #959, [4] Detective Comics #977, [5] The Next Batman - Second Son #8