Am I the only one who thought it was weird that...

Why do you presume she is 12? She was diagnosed with cancer when she was aged around 3/4, her younger sister Anna was created AFTER that and she is 11 in the movie making Kate 15-17.

16 and 21 were the ages of the two actors at the time, FYI.
Although, I admit, the relationship was creepy and pervy, especially as (I recall) the mother encouraged it with a weirdly unhealthy interest - but I suppose they were all rushing things along before death. Kind of made the film more adult though, which is probably right as the other themes are adult too really.

Weren't they receiving chemo in the pediatric oncology part of the hospital? I remember him mentioning they were having some sort of a "prom" and most of the people there seemed to be teenagers, he might have looked old, but I think it was mostly because he was really tall and his attitude.
Her parents seemed to be OK with it because I think they were happy she was experiencing love while she still could. Also he was very respectful of her, and of them.

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Never forget what you are, the rest of the world will not.

I know this is an old post. But it was stated in the movie she was 15 yrs old.

As others have noted, she was not 12 and he was not 20. I got the feeling Taylor was maybe 2-4 years older than Kate. The other reason, though? Imagine for a moment you have a child that is never really expected to have a "normal" lifespan. You grieve for all the things they won't get to experience. College, love, marriage, kids, whatever else they might want. I took Sara's interest in Taylor to be "Maybe my baby girl will actually have a chance to experience love before she dies." If you remember, Sara also got super pissed when Kate told her that they "did stuff." She was still a quasi-reasonable mother, at least in regards to age-appropriate relationship stuff. But if you are pretty sure your kid isn't going to make it to 20, wouldn't you want to encourage a relationship if she happened across one before then? Especially one like Taylor where he wasn't abusive or horrible. He was another cancer kid, he understood her more than anyone in her family ever could, and he was sweet. It was an experience that Kate was beyond fortunate to have, and I think her entire family was grateful that she met Taylor. Plus Kate was so obviously excited by Taylor asking for her number. Probably in part because she felt unattractive as a cancer patient, even to another cancer patient. Sara wanted Kate happy. Simple as that, really.

65 Roses = Cystic Fibrosis

Wasn't she 15 or 16? And he was in the adolescent area as well and was about 17 or 18. It didn't look weird, although I know the actor was slightly older.