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What’s the youngest and oldest you’d date? (lemmy.world)
submitted 6 months ago by to c/asklemmy@lemmy.world
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[–] 3 points 6 months ago* (1 child)

Shouldn't the latter actually be "My age - 7, then doubled"? That's the order of operations to find a number that matches the "half plus 7" rule.

For example, say you're 66 and looking for the lowest age according to the first formula. 66/2 = 33. Then 33 + 7 = 40.

Which should mean that for a 40 year old, the upper age would be 66. If we do 40 - 7 = 33, then 33 x 2 = 66. These numbers match.

But if we followed OP's formula, we'd end up with 73 instead. (40 x 2 = 80, and 80 - 7 = 73.) That's a 9 year difference. Meanwhile, if we did "half plus 7" for a 73 year old, we'd get 43.5. The numbers don't line up.

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