Don't be so quick to answer a question you don't know about.

Yes, it's possible for an admin+ to change your join date, but I assure you that they probably won't do it and I've only seen join date changes happen a few times, including now, mostly as jokes.

In other words, no, you can't pay 100k to change your join date.

Pretty much as Faint said, admins can change username and join date and they have superhuman powers like shooting beams from eyes etc etc.

Also, admins do not like alts, so stop saying that your alt was from ancient 2008s and you want join date change on this account. As fish said, join date won't be your join date if you change it.

It's simple as that.