I'm curious to hear what material you didn't think aged well. I don't disagree personally. I think that basically all of her PWL material, Aphrodite and parts of Light Years haven't aged particularly well.
I'm actually impressed at how well KM94 has aged, aside from "Time Will Pass You By," which has aged like milk.
I listened through Impossible Princess, Light Years, Fever, Body Language, X, Aphrodite, Kiss Me Once, and Golden. I'd heard Disco previously, and only took Say Something.
The only songs I took from Light Years were On A Night Like This (
huge standout), Please Stay, and Butterfly. As an album, Fever actually held up the best - the mixes sound good and the hooks are undeniably strong. Body Language was probably my least favorite overall - I took nothing despite having high hopes for Fever's follow-up. X bled together (which surprised me because that era of music was
so prominent for me), but the singles were okay.
Her 10s discography was pretty strong. Aphrodite was my favorite next to Fever - All The Lovers, Get Outta My Way, Closer, Everything Is Beautiful, Aphrodite, Illusion feel like songs she's just at home on. Kiss Me Once was a mixed bag - Million Miles is well-crafted, I wasn't shocked when I saw it shared writers from Get Outta My Way. Les Sex was probably dated upon arrival but it's a shameful bop.
A lot of these songs capture nostalgia really well, and maybe that differs from aging.