How many active YouTubers are over 30?
And of those how many talk about their lack of a sex life.
For example there is themysteriousmrenter, who only rarely talks about his personal life and mostly talks about cartoons. But during his harassment by a stalker he mentioned that he is totally asexual and "is so pure he could run a unicorn farm" in regards to his non-existent sex life.
But it isn't what his channel is about and it's not something that a casual viewer would know about him.
Not sure if he is over 30 yet though.
Most people who make videos directly about their advanced virginity tend to be ultra boring vloggers who don't have anything interesting to say.
The ones who don't talk about it tend to be autistic and instead make content related to their special interest, and thus not bring up their personal life except rare exceptional situations.