Comment by stubish

And here I am thinking that 50-100g of protein per day for an elderly person was way too low.

But here we have the problems with the numbers and why they should only be guidelines. Consumption of protein needs to increase as you get old (into the range we consider for athletes). And basing consumption on body weight is stupid, because telling an obese person they need to eat twice as much protein as a non-obese person is probably wrong.