Seems fine? I don't really care that much that she's old? It seems like most of the hate for her is this astroturfing by progressives who want her to be replaced with Katie Porter, which makes me dislike Porter even more.
Porter is fine, but I feel like she's overrated. And has just been in congress since 2019. I'd prefer Feinstein to retire rather sooner than later and replaced by someone from the wide and overall good bench of California Democrats. Namely Adam Schiff, Eleni Kounalakis, Fiona Ma, John Chiang or Nanette Barragan, among others, with Barragan as my personal favorite.