That chart isn’t of “how low” the men in the study would go, it the age of the women ranked most attractive by the men in the study. Still isn’t great, agreed, but it is talking purely about physical attractiveness.
Here is the chart from the same study about what age ranges the men in the study said they would find acceptable to date. By 28 years old, 20 is no longer within the field.
That chart isn’t of “how low” the men in the study would go, it the age of the women ranked most attractive by the men in the study. Still isn’t great, agreed, but it is talking purely about physical attractiveness.
Here is the chart from the same study about what age ranges the men in the study said they would find acceptable to date. By 28 years old, 20 is no longer within the field.