Why is it that some oldsters seem determined to jaywalk?

In fact it could be my imagination, but it sometimes seems the less agile they are, the more likely they are to jaywalk. The other evening in Glenhuntly I saw a lady who was struggling to merely push a shopping trolley, and she decided to try and get it across Glenhuntly Road (a mere 100 metres from the traffic lights), and then down a sidestreet… not on the footpath mind you, but along the roadway.
On Centre Road and on Jasper Road I regularly see the oldsters crossing a few metres from the traffic lights. Sure, they don’t usually have shopping trolleys, but they often seem to be less fleet of foot than most.
Maybe it’s just what they’ve done for the past X decades, and they haven’t quite registered that the once quiet road is now chocka with cars.
Certainly I can understand the frustration of waiting for traffic lights. Some of them have been designed by traffic engineers who were determined to waste as much pedestrian time as possible. And I can understand why sometimes you want to be taking the most direct route across a road, especially if it’s a quiet one and you don’t walk very fast.
But in busy traffic, and if you’re not as nimble as you once were, why do it? Unless you have a death wish, use the freaking crossing, that’s what it’s there for!
As for this guy who drives his motorised wheelchair down the Nepean Highway — well it’s not actually the first time. I saw someone doing the same a couple of years ago, and called Triple-0. I wonder if it was the same guy.