According to this random table[0] I found on the intergoogles, you're technically correct but misrepresenting it with your 50-60 figure.. 100 years ago it was around 50, and now it's around 60.

But finding trustworthy data about life expectancy at age X have been really hard every time I've tried to actually investigate claims regarding longer life expectancy, especially because ideally you'd want to exclude deaths by accidents and certain kinds of diseases (but not all!) to figure out at what rate actual longevity has been improved over the years. So I'm still a little agnostic about the whole thing.

[0] http://www.infoplease.com/ipa/A0005140.html