I have my doubts about results of study with only 24 participants aged 28-72 years where they say SOME people over 40 have seen improvements, why don't tell how

I have my doubts about results of study with only 24 participants aged 28-72 years where they say SOME people over 40 have seen improvements, why don't tell how many of these SOME people were over 40? We will end up with what, 5-10 people who saw some improvement? That's anecdotic evidence.