I don’t worry about it, but I don’t like it. I’m less bothered about ‘love’ or ‘sweetheart’, but ‘bless’ is condescending (and I don’t agree that one has to allow condescension - it is all in the intention, not the acceptance).
Unless it’s said when someone sneezes, as that is not an age-related thing. I remember many years ago being in M&S and a nun in front of me sneezed several times. I absentmindedly said ‘bless you’ and she grinned at me and said ‘that’s my line dear’😀.