Good topic.
I’m 77 - medium good health - enough at least to continue motorcycling which does indeed trim 20 years off the age I feel.
Partner fortunately encourages my riding as she sees the positives.
I live now in wet tropical Australia where in theory can ride all year but hot and wet …100F and daily showers cuts a chunk out. Big change for Canuck born.
You mentioned the departed.
Grew up with a couple of smart assed nerds from kindergarden …both went on to astrophysics and we lost touch…but they were there in my mindset. Classmates forever moving through life.
Had been trying to get in touch with Gary my first cousin on and off. He was a social class above me, education, mum a teacher, dad an architect and he did well in life.
Stumbled on his obituary last year …snip went that life thread.
Of course prompted me to check on John - the other physics hot shot..nuclear engineer etc - his mum was the librarian in our small town …big influence on me letting me read anything…and I did - 5-6 books a week from the adult section. Served me well as English major and in business as communicator ( aka salesman with my own company.)
Johns gone too
…both within a year …both my age. Mortality knocking.
Fortunately my best friend from uni is still around - a world away but in daily casual chitchat. A thin lifeline
Joie de vie harder to come by as I age. All sorts of medical issues - non life threatening but stressful, hearing aids, prostate, faint cataracts affecting my night vision, 30 year old bridges giving out - two at once making me eat like a chipmunk, then unexplained tachycardia …no pain, can’t ever feel anything …just my heartbeat going stupid high for 10 min..now that’s gotta looked at. In for catheter check tomorrow…could use a break 
Lack of affection …partner of 20 years sort of lost interest a decade back and had said up front she was not “romantic”. We’ve had good years travelling around the world together so lots of memories tho lost our big screen 5k 27" iMac recently and miss seeing the random photos of those trips.
Especially miss seeing photos of my son who died from cancer at 32 in 2023. 
We were constant riders together, cross Canada together -I’m so glad we had that and I have thousands of photos.
You can’t live in the past but the positive memories help.
Because I’m an expat Canadian I have no social circle here in Australia- dependent on partner and step dottor and with my hearing deficiency and difficulty with the accents I can end up isolated in the midst of a evening out if it is more than another couple. At the same time I enjoy our younger friends - bit of vicarious living.
I know speaking to my uni friend his joy is in grandkids…none of those for me and for reasons unknown slightly distant from my daughter in Canada who I think is struggling but doesn’t share.
I only get glimpses via FaceBook tho we are not estranged. So I know his grandkids provide that effortless physical affection which us beach apes need.
Not going to push partner as she has her own health issues tho she’s more fit and active …loves her gardening as my dad did.
Now dad and mum made 95 - dad vibrant and alert still driving …mum a happy vegetable deep in dementia…so the genes are there…I’d be happy to emulate my dad…walked to ambulance - gone in two days.
Still I look at 20 more years and not sure 
I’ve always tended to be a loner …off on the motorcycle for 60 years..a solitary sport.
I still enjoy being immersed in media, films tv series books galore including audio books and my photography.
Straight Dope is a new found treat.
My uni friend says have new adventures …this is one.
