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Just to reiterate what others have stated…definitely start with the 30 day challenge (4 weeks). After you’ve completed that, move on to the sample 5 day routine (1 week). If you don’t complete these first, the regular daily challenges probably won’t make much sense. By all means, go through the introductory pdfs, which offer detailed information on how to get started.
By the way, I’m in a similar situation as you. I’m 68 and retired a couple of years ago and have no guitar experience. I’m fairly new to TAC myself (60 playing sessions, including a couple of stops and restarts). There are days when I think I can’t do this, but there are more days when I surprise myself at how far I’ve come. I think you’ll enjoy the course. Stick with it, try to play at least a little every day, and you’ll do great.
Welcome, and Good luck!