What you are today is the result of what you were back then. If you could advice your younger one at all this would mean that you change the future and might not exist or are in a worse situation than you are today.

That's true. As it is commonly said, we are only a sum of our past experiences. If you were to give your past self an advice and to follow it. You'd never know if that change will be for better or worse. I guess that will remain a mystery.

Is it winter or is everyone rapidly aging?

I will go with the latter. We are aging. LOL

About my hashtags, I don't think anyone will use them. Because, I have only researched stuff with hashtags once or twice EVER. I guess, people who do search with hashtags would know what hashtags to put on their posts.