Age groups 18-24, and 65+ showed similar upticks for Clinton. Maybe the economy speech jazzed them. Younger ones were promised free college and green energy and protect the environment with regulations. I don't recall the freebees promised to the older generation. Freebees is a tried and true way to get support.
Some people will believe anything, one guy told me two days ago that he is planning to vote for Hillary because he is looking for her husband to run things. I let him know he needs to look again. Bill is falling apart faster than Hillary, not to mention that he was a lousy president when he was in office.