Don't want to go to Apple, but my bank's app now requires updates of 14+, which is not available to ...

Don't want to go to Apple, but my bank's app now requires updates of 14+, which is not available to my 4-year-old phone. Why is four years now too old?? Upset with the bank for designing it to exclude me, but why can I not update to their requirements? Seems unlikely that they would encode such a requirement if it's impossible to access.