@babs10 The recommended protein intake of 0.4 grams per pound of body weight is the official word that is now thought by many to be way too low. Here's a typical quote " The current data suggests that physically active individuals should consume 1.2 to 2.0 grams per kilogram of body weight (0.5 to 0.9 grams per pound of bodyweight) regardless if the individual is a strength or endurance athlete. The upper end of that protein intake is recommended for individuals during periods of higher training frequency and greater intensity and during periods of calorie restriction to maintain muscle mass. "
So we are not exactly strength or endurance athletes but on this group many of us are exercising a lot and trying to increase bone mass and muscle mass and avoid sarcopenia. Protein is essential for that. There are individual differences of course - I for unknown reasons need a huge amount of protein to function in a normal manner.
I suggest Donald Layman as someone with great credentials to listen to on protein. Lots of interviews on youtube and he has a website I believe.