Mature — Female Muscle
It looks like your request for "proper paper: 'mature female muscle'" could refer to a few different things depending on what you're looking for.
: Are you looking for academic studies on muscle physiology , aging (sarcopenia) , or lipid dynamics in mature females (either human or in marine biology, like the Gulf Menhaden study )? mature female muscle
: Are you seeking advice or "white paper" style guides on strength training and muscle maintenance for women over 50 or 60? It looks like your request for "proper paper:
To make sure I give you exactly what you need, could you clarify which of these you were interested in? mature female muscle