I turn 50 this year. what I have learned in my 40s:
"loving yourself" is less of a feeling and more of an action. you can start doing it any time and it will make your life better and better as you go on
this will happen incrementally - be patient
along those lines, if you haven't started making an active effort to quit shit-talking yourself, suck it up and do it
no, shut up. do it. "but it's haaaaard!" don't care. do it.
whether you like it or not, you are mortal and you need to go to the doctor for an annual checkup
stretch regularly - your future self will thank you
at some point you will encounter people much younger than you arguing passionately and incorrectly about history you personally remember and experienced
this will be infuriating and annoying
otoh, most other things just... will not matter to you as much
at some point you will shift from wanting to go out to being like "eh" and deciding to stay in. this is okay.
you will have absolutely no idea what The Youth are talking about and you will not care
but if you keep your mind open to new ideas you'll never be irrelevant
your company still doesn't love you - don't give them more than they pay you for
get a fucking hobby, especially a hobby that involves physically creating/handling something and/or moving your body in physical space. it will do you more good than you can imagine
