When people say 'Awww bless!' it is always said in the patronising tone used for cute pets and very small children. An older woman or man is not a pet, nor are we comparable with small children so we shouldn't be addressed as if we were.
The first time I heard it was over ten years ago. I was saying something about my mother, in her 80s, but mentally and physically in good order. I think it was about her being invited to make a flower arrangement for some high profile flower festival, she was a flower arranger of some note. The person I was talking to said 'Aww bless' in that patronising tone and I was completely taken aback, it seemed so inappropriate for someone, whatever their age, who was clearly a top performer in their field of endeavour. Would anyone say 'Aww bless' if they heard Judi Dench, now in her 80s, had just been nominated for another Oscar or BAFTA award?