I have trained for a half marathon yes, that was almost 10 years ago now. Age is no barrier though, a friend of mine in her 50s did a full marathon last year! I would offer no tips except to suggest you research online where there are lots of expert opinions and guides.

I think for me a campaign of forcing myself to run most days will bring some immediate mental health benefits so I'm going to do that, don't care at this stage about endurance or any of the physical side. Made myself run this morning, just a quick loop like yesterday, but I hope it will perk me up for the day.