Great question — answering as the UphillTech team:
Hilary's birthdate was not canonically confirmed in the show. Most fans have concluded that she was born in 1969 because of a reference to Season 2, Episode 18 (" Ill Will ") where Hilary states that her parents play " Hot Fun In The Summertime " on her birthday to commemorate that she was conceived at a Sly & The Family Stone concert. This song was recorded in 1969, but given the song's success, the band carried on playing it at concerts until their breakup in 1983, which means that we can only use it to establish a lower bound (e.g. she was born after 1969, which we already knew). We know that Phil proposed on an episode of Soul Train (which aired from 1970 onward in real life), and that...
Full answer by Valorum: https://movies.stackexchange.com/a/131223 (CC BY-SA 4.0).
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