Okay,… So I have a character that, for the duration of the project, goes through multiple stages of his life. I use shape keys to change the shape of his body, but the armature doesn’t follow. How how can I make my character’s bones grow with him?

Using scale and shape keys is iffy with armatures… you’ll probably have to make a driver for the armature that drives your shape key.
WOw. I wasn’t expecting such a quick response. Thanks safetyman. My Driver knowledge is very limited. Can you elaborate or send a link to a video that would help?
There are too many to list, but here are some links to get you started.
Comprehensive: https://www.youtube.com/playlist?list=PLbjn7kaP877u1sX4zl081V8jUeSHDY18G
Quick: https://www.youtube.com/watch?v=wHb5rjLlDwQ
Search: https://www.youtube.com/results?search_query=blender+drivers+2.8
I have trouble with drivers also, because there’s math involved
, but maybe those links will help.
Edit: Thinking about this a little bit… it may be a very simple driver that triggers the shape key when you scale the armature in the +z direction.
Many many thanks!