Just for comparision, Democratic nominees since 1976 by age (at election day, since some were nominated before their election year birthdays)
1976: Jimmy Carter (52)
1980: Jimmy Carter (56)
1984: Walter Mondale (56)
1988: Michael Dukakis (55)
1992: Bill Clinton (46)
1996: Bill Clinton (50)
2000: Al Gore (52)
2004: John Kerry (60)
2008: Barack Obama (47)
This trend also reverses in 2016.
Democrats:
Hillary Clinton- 69
Andrew Cuomo- 59
Brian Schweitzer- 61
Russ Feingold- 63
John Hickenlooper- 64
Martin O'Malley- 53
Republican
Chris Christie- 54
Mike Pence- 57
Bobby Jindal- 45
Paul Ryan- 46
Scott Walker- 49
I'm standing with my opinion that at least one of the two major nominees in 2016 will be someone we barely heard or consider of at this moment.