Sadness is transitory, but a lesson of life.
November of 1989 at age 53, was one of those lifetime lessons. Cancer interrupted my entrepreneurial venture of three years, and triggered the decision to take a chance on retiring early. We didn't have enough money to do that, but by changing our priorities to live within our limited assets, it has worked out, so that 28 years later, we are still solvent, happy, and can see our way to a many as 15 more (solvent) years of life... unlikely, but possible.
More than half the people born when we were, are no longer here. One of the factors that helped in our decision, was our age. This was always the fallback. Both my DW and I were prepared, if necessary, to return to the workforce, not in the former positions, and less pay. In moving to a retirement community, I could do lawns or small repairs as an income supplement. Fortunately it turned out to not be necessary.
Fast forward to yesterday, in our CCRC main building function room. We joined in a group game of Trivia. At age 80, we were the "kids"... Of the 16 people who joined in the game, one was 100+, two were 97, four others were over 90, and the rest between 80 and 90. All of these people are alert, intelligent, and came to the group on their own... Some with walkers, some with wheelchairs, but all independent, and there to enjoy the meeting.
We don't even know what the next five minutes will bring, but we look ahead to be as happy as possible, to enjoy life, and not to dwell too long on sadness or worry that can be unproductive.