Elderly? Maybe a wizard or kung-fu master (did they even consider these stereotypes?), but your typical elderly citizen isn't taking on endless physical fights with gusto.
Female? As if females were as strong, tough, and physically aggressive as males? Show me the dominance of females (esp. thin, frail sexy ones) in coed boxing or MMA, or competition shooting, or military ops, etc. As such, it looks like females are actually overrepresented.
Racial minority? This would be influenced not only by the number of those involved in such types of dangerous adventure, but also by concerns over portrayal lawsuits (e.g. "The character does what?!? Racist! Racist! Racist! Shut them down!"). And then there's the predominant racial makeup of the target consumers; if the main videogame appetite (and production) were in South America or subsaharan Africa, there would be a natural tendency to have more people from that market reflected in the products.
An additional factor in this is education. Ethnicities that emphasize education tend to end up with more jobs using advanced technology, including dangerous jobs.
If, to remedy this 'problem', one looked at the Bureau of Justice Statistics on crime to shape the numbers on race and activity in a game based on street crime, a lot of those same social scientists would cry foul, as certain groups would then be 'overrepresented'.