First, dig out the characters in all the photos with ps, then put the pictures into pr or ae and discharge them in order of age. For young photos, put down the layers, align all the layers, then make a background on the bottom layer, adjust the opacity except the background layer and the minimum age layer to zero, and then drag the timeline in turn to do opacity animation, thus increasing the opacity of the upper layer and reducing the opacity of the lower layer.

One way to shoot Tik Tok is to use makeup, so that you can start from a young age and then gradually make up as an old man to shoot. Many movies and TV series do this. The other is to play this person with different people at different times.