Winston Churchill has, rightly or wrongly, been quoted as saying that, "If you're not a liberal when you're 25, you have no heart. If you're not a conservative by the time you're 35, you have no brain."
The actual origin of the quote though appears to be John Adams. “A boy of 15 who is not a democrat is good for nothing, and he is no better who is a democrat at 20.”
Democrats tend to perform better with younger voters. Obama won the 18-29 vote by 66 to 32 against McCain and 60 to 38 against Romney. Hillary however is underperforming at 38 to 27 with 19 percent going to Gary Johnson.
Maybe Hillary needs to talk about how she inhaled.