This is your space, your place for thoughts, self affirmation, etc... We are just visitors here reading what you write - if it's to us as an audience or to yourself in a public diary, bravo... Gather value from it and see yourself as a vital person in every way.
It does make me sad that you believe 36 is "middle aged" though - I mean, at 58 then what does that make me? Age is a number that is a measure of how much experience you have being Mina and nothing else. It's an artificial construct that's all - don't let it be a limitation. Focus on being yourself, loving and cherishing your self, value yourself with esteem, live and dance like there is no one watching you. You want to put pictures up of yourself - live it and celebrate it! Look at yourself from outside and celebrate the you that you've become. Grow the inner you to match the outer you and be the person your daughter, your kids admire and emulate through their lives. Understand that you are a complete package that will grow in knowledge and experience every day. Use your age as a number to gauge how much you have left to do and experience in your life - how much wonder there is in living, living with grace and absolute joy. Be that example.
I write this from the perspective of someone who has survived cancer, heart attack, AFIB, serious gall bladder infection, life threatening food poisoning and dehydration, falling through the ice on a frozen lake in the dead of winter, have had a shotgun barrel pointed in my face by someone who would have had no remorse had it gone off... but also someone who has contributed to work that has impacted hundreds of millions of people around the world, has written and recorded music that has brought pleasure to myself and many people who have found it on Spotify, Amazon Music, YouTube Music, etc... a father of three boys who I have faith will not just make me and my wife proud but also themselves. A partner to the most amazing intelligent beautiful woman I've known, my 2nd chance at having and being someone's soul mate. I am telling you to be fearless and live a profoundly wonderful life from a position of knowing implicitly and explicitly what that means - take my word for it, you deserve it so go get it.