All the values may have an uncertain margin of error.
So I can make a list for my leaderboard :- I use Streamlabs and StreamElemets, Wizebot, and an array of Discord bots but haven't found that, exactly.
If you've been subbed for 3+ years, The streamer knows who you are and it doesn't matter that you couldn't sub for a month or 2.
You can see the full length of your followage in year, month and day format and see the details for the streamer and channel.
Dumb question, but there's no sticky for dumb questions, so here it goes.
It's cosmetic and vain by nature.