Is it too late to start on guitar after 40? People say it becomes more difficult to master difficult and/or fast chords and licks at later age, is that true? Would it help to get a live coach or do online tutorial websites work well enough?
Never too late to start making art! Get a guitar and start learning some chords.
I would not concern myself too much with mastery. Instead, how about making yourself happy? Learn a couple of tunes! I don’t think there are too many better ways to calm your mind and improve your mood than playing guitar. Well, there are a couple, but guitar playing is right up close to the top, imho :-)
Regarding online tutorials or a live coach: there is so much good information available online, I’d start there. But you almost certainly know your own learning style- just use what works best for you. Good luck!!