Tokyo, like all Japanese cities, towns and even villages, is a special case, because transport is approached from a bottom-up viewpoint. There are train stations within, I'd say, every kilometre, and beside each station, or virtually all stations, is a long-stretched-out two-storey bike parking facility with a caretaker keeping an eye on the sorta-locked bikes; parking in these costs around a fiver a week.

Train travel is by no means cheap, but it's universally used, and it's fast and efficient and simple to navigate. (For example, local stations where I was last staying had birdsongs playing on the platform, louder by the escalators, and different birds for different stations so the blind would know where they were, while the songs were relaxing and pleasant for both sighted and blind. And have you lost your keys or mittens or cap? They'll be hanging on the hooks by the turnstiles.)

So people of all ages cycle to the station and leave their bike there.

Meanwhile, worried about senior moments? Cycling may be the answer.