In my country, the elderly used to ride for free on busses and trams. 15 years ago I was involved in this problem where some decided to get on a bus or tram in the morning, go back and forth all day, bring a lunchbox, and go home just in time for the favorite soap series. They got free heating and some social contact.

It turned out, in my region, about 1/3 of public transport capacity was lost on them on peak hours. Also, some decided a specific seat was 'theirs' and started verbally abusing 'seat thiefs', throwing their stuff around, or even hitting them with canes. They also drove everyone bonkers by begging drivers to speed up or change routes so they would be home in time for their favorite soap series.

At the time, not much was done about it. The busses and trams forced everyone off at the terminus, made a round, enforced being empty while pausing a bit, and then the elderly were allowed back on, but at least places got shuffled and others got a chance for a seat. There was great gnashing of teeth about this decision.

I still feel double about it. It is very sad how this was a great life quality improvement for these people, but public transport is not the right medium for fixing this.