TO Eras tour, can teens go without parent?

I just bought resale tickets and I could only get 2 so I want to send my daughters. They will be 16 (her bday is the day of concert), and 13 (one week shy of 14). They will be sitting next to an acquaintance that I bought the tickets from. Is this allowable for their ages ie any rules preventing this? And is this smart as a parent not to be with them in such a large crowd (not by choice obvi, I have fomo!). Not sure what to do, this is likely my only opportunity to get tickets for them but the large crowd and their ages makes me nervous. Tia!