Which is the best strategy for avoiding long-term stress?

Dont have kids would be a good start

Now that you're treating your body well and taking deep breaths, walks, or whatever else you need to do to stay calm, why isn't your life completely stress free? first, you must remember that life is never stress free. (if it was, it would be pretty boring.) second, you must accept that there are some stresses in life that can't be avoided.