Unfortunately, I have liberal friends that are "concerned" about Biden's age to the point of arguing with me about it. So, in my little liberal sphere in a dark blue state (Washington) some people seemed worried about it. Then they don't like Harris and I wonder what TV stations they are watching because I can tell you almost nobody under the age of 40 cares about any of this, except they don't want Trump to ruin their lives. (I have 20ish year old kids).
I think when it comes down to making a choice in 14 months, anyone with half a brain is going to pull the lever for Biden and he will cruise to a 2nd term.