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It's perfectly normal.  If you're only just now experiencing this and you're 70 years old, you are in excellent health.  It happens every day to millions of people, young and old (although it happens more often the older you get) because of stress, caffeine, emotions, or any other number of reasons.  The name of this is premature ventricular contractions, which means that your heart gets the signal to beat again a tiny bit too soon and so it flubs up your rhythm.  As long as it goes back to normal within a beat or two, it's like 90% you're perfectly fine.  If you were younger I'd say don't even worry about it, but because you are 70 I'm going to say don't worry about it but go see a doctor if you find you can't forget about it, because on occasion, (very rarely) it can be a symptom of some underlying heart problem.