We are creatures of habit. Every time we think or act in a certain way, a habit is forming. Like a groove that is being furrowed deeper and deeper, each repetition adds depth to the habit and makes it harder to break.
Our habits rule us. They dictate our actions and reactions. We think we are making choices, but in truth much of our life is predetermined by our habits.
The older we get the more set in our ways we get, so it becomes less and less likely we will change our speech and behavior patterns.
If you have habits that you are not proud of, deal with them now. It will be harder and harder to break bad habits as time passes.