LOL! I'm certainly not letting my 11-year old take her passport to school in case she get's ID'd on the streetcar! She's very tall for her age too, I know smaller 13-year olds ...
With all the hassle, I don't really want her taking her Presto card most of the time, in case it got lost ... it's useful to get her through subway gates, but she's never had reason to take that by herself (though she easily could if we lived by a subway station instead of a streetcar stop).
I use a plastic enclosure attached to a lanyard around my neck.
Do a google search for transit pass lanyard. DO NOT PUNCH A HOLE in the card.