Well, it seems that 40 is a psychological barrier or something like that, because you have to see the number of unfaithful wives, vicious whores and horny women who are that age. They think they are living the new twenties or something like that, although now with more experience and more sexual appetite. And the sluts know very well what their mature pussies want and need!
Therefore, it is normal that they become the queens of online porn, it is inevitable. The best thing is that you can also find forty-something amateurs with the same desire to fuck as these xxx actresses. Just search among the mature women you meet on your nights out, and you will surely come across some.