Yes I know there are still people who are using the old iPhoto application to manage their photos on the Mac. It was a great App, but it has been replaced with the new Photos App. If you are still using iPhoto and are thinking about updating to Catalina, think again. The iPhoto App will not work in Catalina. Besides never updating your Mac past Mojave, there are alternatives for your photo library. This article lists several ways for you to go, check it out.