How should I welcome my former students to adulthood?

It's been 10 years since I started internships in after school activity clubs & elementary schools. Next year the those in 1st grade are now 18 and 6th grade are 23!

The teachers, sudents & staff together gave me the inner peace while I was an intern, learning to become a substitute teacher. In my childhood (because of ADHD diagnose) I was raised to believe I will never become normal, dont even dream of entreprenuership, uni degrees or anything, all because of childhood diagnose. In the primary school I was thaught how to succeed, even parents started saying my work had made me important not just to the kids but to the whole families as well. Those who graduate unis, get the title of qualified, I got the title of being important. After the internships were over I became a youth worker, a substitute teacher without the title of qualified teacher because its lower leven career school, not uni!

What I want is to make one letter to those entire age groups, welcoming them to adulthood. This is not the future I could have warned them about. We are each year closer to WW3, news papers filled with generals speculating nuclear wars. In adulthood, I learned the hard way hierarchy based abuse of power, over complex/counter productive byrokracy, the real quality of public services, and how hard life can get for those that fall behind from the mainstream. There is so much that schools just dont prepare students for all the good, great, bad & worse of adulthood!

Hardest is to decide what to tell them and what not to! Then comes the how, when, where and even the question of professional distance, the question of should this be done at all?
How should I welcome my former students to adulthood?
How should I welcome my former students to adulthood?
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