I have already given you my answer in the 4b thread (Deva), but just a quick one to allay any fears: I'm 34, and definitely not experiencing any kind of slowing down of growth cycle.

Good luck deciding on what cut to get. There are a few threads on here if you do a search- that was how I decided on Deva in the first place.
Products in current rotation:

Terressentials Pure Earth Mud Wash; Elucence MBC (now really just for cowashing, leg shaving or emergencies); Curl Junkie: Repair Me, Deep Fix, Curl Rehab; AOHSR (retiring); Oyin Handmade: Honey Hemp, Hair Dew, J&B; Qhemet Biologics: BRBC (retiring- prefer Oyin HD), AOHC, OHHB; Jojoba Oil for scalp; Castor Oil or Shea butter to seal; Henna & Ayurvedic pastes when I can be bothered.

Still searching for the perfect stylers, but loving CJ CIAB over everything so far