We really need to limit the driving hours for taxi drivers in their 70s...

Two days ago, a taxi and motorcycle accident left a motorcycle rider in critical condition.
‌
Yesterday, a vehicle crossed the center line, drove onto the sidewalk, and struck a couple in their 40s; the husband passed away.
These things happened just between yesterday and the day before..
The common denominator is that all these accidents occurred during night driving.
The drivers weren't under the influence of drugs or alcohol; they either stated they fell asleep at the wheel or the accidents are suspected to be caused by failure to maintain forward attention.
Because of their age, their reaction speeds are slower, their vision is limited at night, and their physical stamina isn't what it used to be, so their attention span must drop even faster during night driving. Night driving is difficult even for young people, let alone for taxi drivers in their 70s.
Seeing these accidents repeat constantly, I feel like night driving should be restricted for taxi drivers in their 70s.
Otherwise, it feels like these kinds of accidents will just keep happening.
Even outside of nighttime, elderly drivers have many accidents, but nighttime is truly...