Anyway, Web Warlock wrote: "What was Tara doing the year in between running away from home and her meeting Willow? 'Family' establishes her age as 20 in Season 5 and that she ran off sometime after her 18th birthday. We gather she entered UC-Sunnydale at 18. She spent Season 4 with Willow. What about the time she spent before that?"
I don't think there's any missing year there. Tara turns 20 in "Family", yes, but that ep does not "establish...that she ran off sometime after her 18th birthday." What her father does say is "Your family took care of you for 18 years, Tara." I never construed this as meaning that her family took care of her for exactly 18 years and that she left home right after or soon after her 18th birthday. I think it just means that she was 18 when she left--and since her birthday is in November and since, as Web Warlock mentioned, "[w]e gather she entered UC Sunnydale at 18," my guess would be she left home and came to Sunnydale in August of 1999 to start school. At this point she was 18; in November '99 she turned 19. In December '99 she met Willow, and the rest is True Love.
Anyone disagree or have other theories?
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"Yes yes, I've got to get home to that good pie."