They are attacking the Ederly to hinder Republican voting base.
Study: Elderly Trump voters dying of coronavirus could cost him in November
An academic journal projects that deaths of 65-and-older Republican voters in several swing states will far exceed those of Democrats.
https://www.politico.com/news/2020/04/23/how-coronavirus-could-upend-2020-battlegrounds-204708
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A new survey is finding that the only group voting Republican by a majority are those 65 and older.
The survey by AP Votecast, reported by The Wall Street Journal, found that 49 percent of voters 65 and older voted Republican this election cycle, compared to 48 percent who voted Democrat. Those 65 and older accounted for 26 percent of total voters in the survey.
https://thehill.com/homenews/campaign/415356-survey-only-group-breaking-for-republicans-are-americans-65-or-older
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https://www.theguardian.com/news/datablog/2016/sep/23/older-americans-vote-republican-fact-check-election-2016