I think it's pretty clear we aren't going to have a president born in the 1930s, which would be the first decade to not be represented there since the 1810s. It's possible we may still have one born in the 50s, though.
Right now, we're in an era in which the last three Presidents have been elected to two full terms, so with a new President every eight years, some decades may be under-represented.
The 50s could be one decade, since two Presidents born in the 40s were followed by one born in the 60s. So, if Chris Christie (born in the 60s) or Marco Rubio/ Paul Ryan/ Jeb Bush (born in the 70s) is elected in '16, it becomes increasingly unlikely there will be a President born in the 50s.
Jeb Bush was born in the 50s.
