Reminds of an annual project by my daughter’s 6th (?) grade teacher. As an assignment, she had all of her students write a letter to themselves, in a self-addressed envelope, before they headed off to middle school. She vowed to post them in their senior year.
Those letters, in particularly the quickly penned content, were all since forgotten - and were that much more fun when they actually arrived. My daughter was surprised to read how “sassy self” had actually set herself a certain college goal/reach 
)