Sorry you are feeling low op. I'm in my fifth decade too and tbh, not many of us look better at this age! An exceptional few perhaps. What do you think is stopping you coming to terms with this? (Genuine question; not being snippy.)
People are saying the "inner beauty" stuff is crap but it really isnt imho. Character is far more important than looks. As they say, beauty fades; dumb lasts forever! 
And call me old-fashioned, and I don't mean this at all unkindly, but if we are in possession of two eyes, two ears, and four limbs that all function, and a body that works reasonably well, then we can count ourselves very lucky indeed.
Other than eating well and exercising well, we can't really change our looks. So maybe you could be kind to yourself, write down how you feel, acknowledge it as you are doing on this thread, then put those notes away somewhere safe, and resolve to focus on other things that you can change for a year? Then in a year's time, read the notes again and see how you feel? Hopefully, with some serious effort, you will feel very differently indeed.