Just some light reading from the forest service and something caught my eye. This is related to ponderosa pines, but could probably be applied to pines of all ages.
When we are styling them and hoping to signify age.
Here is the article from 2003 if anyone is interested. https://www.fs.fed.us/rm/pubs/rmrs_gtr110.pdf
Another cool bit. There are a lot of stories to tell when styling our trees, if we want to tell them.