When storage space in phones was more expensive, I used to copy older photos to a computer and delete them from the iPhone photo album. Now that phone storage is more affordable; I copied all of them back again. I also copied many of my private photos taken with standard digital cameras to the phone.
I have 120,000 photos from the end of the 90s and until now available in my phone photo library. Everything from the kids growing up to celebrations, vacations, and house renovation projects. I also have over 4,000 videos. 🙂