The new jobs are certainly lower-level content, as is stuff like the Mog Resort. The -zone- monster content is definitely aimed at higher level players, but you're 30+, so getting in, unlocking RUN or GEO, and playing them is absolutely doable. Many of GEO's spells actually require exploring the old world for "founts" to gain use of them, so you can unlock GEO and be happily picking up those spells off founts when you exp/explore those areas.