I feel so old now that I realize people can have almost a decade's worth of history available on their mobiles. I legit remember when I was 8, in 98, and the mobile device we had to record things was a VHS camcorder that was the sleekest shit back then, still this giant two-handed camera.

Saladofstones said:

I feel so old now that I realize people can have almost a decade's worth of history available on their mobiles. I legit remember when I was 8, in 98, and the mobile device we had to record things was a VHS camcorder that was the sleekest shit back then, still this giant two-handed camera.

TBH, Kaede is now between 高1 and 高3 -- first and third year high school.
Since the picture was taken when she was 中1 that means that minimum two years, maximum five in between.

Mihari could have transferred the picture from an older device, or could still be using the same device.