In spite of the inherent, and ongoing health issues, my parents seem to be enjoying their late-70's early-80's. I think they get some degree of satisfaction in watching the five of us offspring struggling through our 40's and 50's, some with little knucklehead kids of their own.
Happy Birthday to your youngest, Coz. My Granny Huncote would have been 103 today... tough ol bird, she was.