What's the problem with that? If somebody uses that Presto card, when a fare inspector checks their fare (systems like TTC, GO, UPX, OCTranspo, Viva) or they tap and it makes the concession sound (YRT and other non-POP systems), they will be challenged to show proof of age, and fined+have the card confiscated if they can't.
I am obviously aware that seniors pass away, my point is that there is no purpose to having an expiry date on the senior fare classification since seniors do not transition to another fare category, unlike children, youth/high school students, or post-secondary students. Why create a huge amount of additional work for transit agencies and seniors themselves, who will likely be significantly inconvenienced by having to regularly go and re-up their senior discount, for something that is a non-issue due to fare inspection?
