I'm 48 and have been transitioning away from using hair dye since March 2020 (26 months) and have already found huge amounts of support and encouragement from the Katie Goes Platinum site and seeing other women's journeys on Facebook groups.
This book is a gamechanger as far as I'm concerned - easy and pleasurable to read, lots of advice on what to expect and ways to deal with potential hurdles, along with acknowledgement that everyone's journey is different, and that that's okay!
There are also product recommendations for different circumstances (although I'm in the UK so they might not all be easily available to me, but I've not checked yet) - the biggest positive for me in my journey has been this kind of encouragement in what has been an incredible personal journey that ends up being about much more than the hair, but about learning self-love and kindness!
This book gathers all of this and links to more in one place - buy it if you're considering this journey, you won't regret it!