So I started about 42 years old.
I was about 18st 10 on day one.
I had run since about 32 years old on and off.
Running everyday is a challenge. It’s very very difficult. I weighed up the advantages for me over the disadvantages and decided to keep going. I never thought I would hit two weeks let alone nearly 5 years.
The main advantages are the health and fitness plus mental health benefits. No excuses required every day as you know you are running. Stepping up to long distance races was simple, as you always have 20-25 mile base. Weight loss ( but be careful- 3 miles ain’t gonna overcome a mixed grill)
Disadvantages. Time. Organisation. Family commitment. Running with niggles. Running with injuries. Running drunk / hungover, at midnight.
If you decide to do it, I would strongly recommend having 1 mile as your default minimum. It means you can really ease back. Doesn’t stop you running marathons etc if that’s where you get to.
Overall- be cautious- I would want a lot more running under my belt before taking on a challenge like this.