I am now 70 and have accepted that I am now on the downward slope that eventually leads to death. Most of my immediate family have had long lives (85+) with no mental impairment and few physical difficulties, so I feel hopeful that the slope will be long and acceptable.
I have found that I have reached this stage gradually. Under 50 or even 60, death among my contemporaries was accepted as one of those damn things that happened; several friends and acquaintances died while I was at university, car accidents, leukaemia and suicide. My sister died in a car accident in her mid-40s, another acquaintance was drowned on the Herald of Free Enterprise. Another very close friend died of cancer aged 51, again, all accepted as the low level loss that accompanies life
My dearest friend died at 64 when I was 65. It was lung cancer, she had become a non-smoker, but too late; but I faced up the fact that, whether smoking related or not, it was the first to signal the first dip in the slope.
Then in early March, DH's 'brother' died. Not a blood relationship, but two boys, both only children, whose friendship almost preceded birth as their mothers were friends. Both families have always spoken of each other as 'family' and are linked by God Parent ties. Our DF had had a few grumbling health problems that required medication but had no real affect on his activities for some years but his cancer and the unexpectedly short survival time after diagnosis was a shock. As he was 70, like us, DH, DF and I were all born within a month of each other, It was a deep and profound shock, that we still are coming tot terms with.
But one thing it did confirm, all deaths among our contemporaries now are normal attrition not exceptional. That's life and it ends in death.