I can ASSURE you youngsters that is ESSENTIAL to have some stocks that pay good dividends in your pension portfolio. You can very well trade untill your 100th birthday, but some regular income gives you more certainty. Economic uncertainty in older age - or in any age - can cause you bad trades or deals if you are compelled to sell something unprofitably to get money for something.
Of course you can have other kinds of secure income, main thing is that there is some. Dividends is an easy way for that.