Older people care more about consistency than "usability". They can successfully complete long tasks, maybe with several retries but they can, but if they are consistent. Input a long text somewhere, dial 15-20 digit phone number etc. But they can't usually deal with unpredictable situations, where computer will "intelligently" help them, fill parts of the input, when same action is different on different devices, when they need to know how system will behave in advance.

PS: consider how you would guide an older person over the phone when he/she is accessing Citibank website (for which www.citibank is different website), with Chrome will "intelligently" hide essential part of the address.