Is there a wiki for those who are older (45+)?

I’m nearing 50 and a finally getting serious about retirement (ugh I know). I’m reading thru the wikis here but I feel like I need a different approach than someone who’s in their 20s. Does this resource exist? Here is an example of what I’m struggling with. I’m maxing my 401k including catch up and just started a max backdoor Roth with Fidelity. Now I’m at the investment point. I asked chat gpt and it said that considering my age and goals I should do 45% FXAIX/55% FXNAX. Is this a good strategy considering I want to retire in 15 years?