In Jan 2015, aged 58, I had been a smoker for 45 years. I stopped and thought running might be good motivation to stay "stopped". I'd never ran previously and it was a struggle to start with. Parkrun helped and I gradually built up speed and distance.
I now run an average of around 25 miles per week, and completed my first marathon a day or two before my 60th birthday. I've another couple of marathons later this year too. Needless to say, I've stayed "stopped".
I'd recommend running to anyone - if I can do it, anyone can !