Grounded for three years

In D&D, the standard assumption is that elves mature just as fast as humans, but they are culturally treated as children until around hundred or just a bit higher. But I’ve started developing a campaign setting where elves really are the equivalent of kids until that age, and all the implications of that. One of which is that, if humans attended school alongside elven kids, they’re going to lose their reputation of mystique and wisdom— they’re going to be viewed as kinda slow and dimwitted, as the humans graduate through the grades and the elevens get held back a decade or so.
- Reminds me of the humans in this HFY
  https://old.reddit.com/r/HFY/comments/3aukx7/oc_the_slow_people/

Where does this math come from?
- Nah, it checks out. I ran the numbers myself and I got 15.33, which is roughly 15. This, of course, assumes the age of adulthood is 21 for humans and 100 for elves, and we don't really have a reason to doubt those numbers.
  
  Why would we assume that you have to be 21 years old or the equivalent to drink alcohol in a medieval fantasy world?
  There are still many parts of the modern world that allow 16 year olds to drink.
  And even in the medieval time period of Europe, pretty much everyone would drink alcohol because it was cleaner than water, although younger people would tend to drink "small beers" that had very light alcohol.
  My assumption would be that in this time frame, if the bartender judged you competent and capable of drinking, they would sell you alcohol.
  If they didn't, they wouldn't, and the only consequence would be that you're on your own in dealing with the effects of alcohol on you.
  
  Others have doubted the 21 year figure being appropriate for humans but I think the 100 year figure is ridiculous for elves. It’s based on the assumption that age of maturity and total lifespan are always preserved in an exact ratio across different species, when this is demonstrably not the case.
- I guess the 21 being equivalent to 100 years is just an assumption
  
  Which kinda makes the math meaningless cause 73 < 100 requires no calculation.
  
  it's a generally accepted assumption in many post-Tolkien fantasy works.
- Solving percents. I use this to predict gross and net of my paychecks when I do my budget.
  
  Net X ------ = ------ Gross 100 (GrossX) = (Net × 100) GrossX ÷ (Net × 100) = X Example; 200 X ------ = ------- 250 100 Step A 200 × 100 = 20000 Now 250X = 20000 Step B 20000÷250=80 Therefore X=80 Also expressed as 80% of 250 = 200.
  It's also kinda handy when figuring out sales and stuff at the store, sometimes.

Hot 73 yo jailbait
- This is the elFBI, open up!

Meanwhile, her ~~mother~~ grandmother: