Just wearing a helmet is not enough. Does it fit? Has it been adjusted properly? I see kids with loose helmet straps all the time. Mostly adults wear them correctlly or don’t wear them at all. –Corrie
But a helmet will do little good if it does not fit properly or if has lost effectiveness due to aging or damage. So it might be time, especially if it has been a while, to give that brain bucket a close examination or consider purchasing a new one.