Car does not always start when the key is turned on. on 2001 Buick LeSabre

Four or five times in the last two months my 2001 buick will not start on the first try, but will start on the second try.
There is no noise on the first try.On the second try it starts normal. Does this indicate that it may not start at all some time in the future? What do I do to fix it? The battery is two years old.
Thank you,
Phil Morey

Asked by for the 2001 Buick LeSabre
whne you say not start, is that it does nothing or it turns over but will not start?
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