I don't like the idea of festooning profiles with this kind of warning, but I think it's a worthwhile caveat -- an alert that we should look carefully at the evidence.
I have a Massachusetts ancestor who has sometimes been mistakenly claimed to have enlisted as a private in the Continental Army in 1780, when he was 56 years old. An ancestor of his age could have had Revolutionary War service, but it would typically be militia service that began earlier in the war (for example, I have other ancestors who "turned out for the Lexington Alarm" in 1775 at rather mature ages), or patriotic service, or civil service. It's unlikely that he would have enlisted as a private in 1780. In this case, the 1780 enlistee was his nephew who shared the same name.