Is this actually true, or just bias from your own interessts? If we look at technical stuff and gaming, we see far more successful male influencers. Similar with entertainment-industry.
> and only a minority would want to follow a 50 year old
This more or less is true, because not many like to see unattractive people doing boring things. But the point here is, this in not because of gender or sex, it's about the quality of content and chemistry with the consumers. An old ugly guy without any real skill, would be usually as unsuccesful as an old ugly woman without any real skill. Though, for both there always is chance to find niche to sellout your content over something, the chance is pretty low.
With younger and more attractive people, the chances are significant higher, because they have more selling points besides the content itself, thus they sell better. But it also depends on the target-group and content.
> it’s human nature
No, it's human culture. People sell according to the crowds reception on what the gender is suposed to do. So woman sell better in female-stuff, men better with manly stuff. Woman do have a slight advantage, in that they are the gender which in most cultures is educated from early days to sellout. They dress up, use fancy cloths, catter to the people, etc. This works better for laymen when becoming influencers, because woman have more likely the skills to sell themself on a broader are, while most men need to learn it first.