I have been considering upgrading from Windows 7
There is no answer, because.......
There is no definitive answer to be had.
You need only to read through the forums (this and others as well) to find a multitude of upgraders who've experienced any number of problems with their user profiles / account information (settings).
That is one of the reasons I always recommend performing a disk image in advance of even thinking about upgrading.
At the risk of sounding like a broken record, read this before proceeding.
https://www.windows10forums.com/threads/please-for-your-own-peace-of-mind.794/
Personally, I have never had an issue with a single user profile or any account / password / anything else..... after upgrading to Windows 10, and.....
I've performed multiple upgrades on various computers, several of which, including my wife's Windows 7 Pro 64 bit machine, which had five separate local accounts (for the grandkids when they need a computer during a visit).
No problem at all in my experience, but....
Your mileage may vary, so.....
Protect yourself with a known, good, viable, disk image just in case.