I'm only now allowing myself to take this seriously and I want to say something to the people who started late
I wrote my first real novel at 39. Not my first attempt, my first finished thing. Before that I had about fifteen years of abandoned drafts, half started outlines, notebooks full of ideas I never developed. I'd been telling myself I was "a writer" the whole time without producing the evidence to back it up.
What changed in my late thirties wasn't talent or time or some breakthrough. What changed was that I stopped waiting to feel ready. I'd spent my twenties and most of my thirties believing that someday I'd have the right circumstances. The right desk. The right amount of free time. The right level of life experience. The right confidence. None of it was ever going to arrive on its own, and at some point I just had to start writing badly, on a kitchen table, while exhausted, and trust that the work would teach me how to do the work.
I see a lot of younger writers on this sub who are terrified of being too late, and I see a lot of older writers who've quietly decided they missed their window. Both groups are wrong, and both groups are wrong in the same way. There is no window. Penelope Fitzgerald published her first novel at 58. Frank McCourt was 66 when Angela's Ashes came out. The only thing that disqualifies you from being a writer is not writing.
If you're in your forties or fifties or older and you're sitting on a book you've never let yourself start, this is the only permission slip you're going to get