I am 62, but started to count backwards on my 35 birthday. At zero I will be gone, I have no financial needs, I have raised 4 children (out of which 3 were not mine), all of them made University, one became pilot, I have seen it all, was working all over the world, had a lot of girlfriends, had times in my life which were horrible (when young) and live now relatively good.
But small things can now stress me up to breaking point, this is true. I lean more to depression. Loneliness is ok - I live with it, I am still separated physically from my partner (visa question) and try to live as good as I can. I fall back on regular basis, get depression, stand up again.... But how long this will and can continue depends on a lot of things, I survived so much (bombs, attacks, shooting, suicide attempts, jail...) not a lot I have not done or experienced. I am a dependent person and fight all the time.
Now I am in more peace - as finally all kids have left home (they are all in France or Spain) and the issue with my wife will be solved now hopefully this year. Otherwise I learned one thing- love and hope and believing in god is the best way. And yes, miracles happen - I know that 100%.
Sport if the best thing to stay fit, on line and balanced - this is at least what I learned. I wrote a book about my life and might publish it soon. It helped a lot. Family - no contact any longer.