I don't think it's an unfair comparison of elderly drivers to young moms, as many of you are arguing is unfair.
Oldies' brains / functions are diminishing.
The frontal cortex of people under 22 is still developing (the part that controls reasoning and the ability to think before acting).
So plausibly, an MRI could be in order to check brain development of young mothers, just as driving tests are in order to check the safety of elderly drivers.
Carry on with the eye-rolling, then.