To begin with, here’s Priscilla as we meet her in the movie at age 14. There aren’t any publicly available photos of Priscilla at this age, but there is this one of her at age 16. It’s worth mentioning that the necklace she wore is re-created in the movie itself.
Source: https://www.buzzfeed.com/natashajokic1/priscilla-movie-jacob-elordi-cailee-spaeny-pics