What is the "the category of women most likely to have an aggressive, early cancer" that Jade Goody fits into? I'm curious.
Cervical cancer is caused by HPV and it progresses very slowly. If you have a smear test once a year, you can't possibly miss its progression from zero to CIN I, CIN II, CIN III, and Cancer-in-situ (just like a mole, easily treatable), which take at least a year between each stage.
This also means early onset is very normal - if you get infected with a carcinogen type of HPV during your first sexual intercourse at 13, for example, and never have a smear, you can easily have cervical cancer at age 20.
I'm not saying this to blame Jade Goody but to reassure others on this thread - Do your smears regularly and you will be fine.