It's great that you are so relaxed about it. Of course, older children can still benefit from the advantages of a diaper, for example on longer car trips. If you handle diapers naturally and don't make them into something special, they can be used without age limit.
At our house, diapers are still used every day, during the day and at night. And accordingly, there are no car trips without our boy going to the changing table first. Even for short trips he always wears a diaper.
You can have a look at our changing table here: https://tobischangingtable.wordpress.com/