Wow, and my sympathies to you @Widowodiw.
I notice one or two males on here, brave blokes! But I also notice quite a few posters making the point about how op would be received if she was a he and made the same comments about PP.
Firstly, men of his age and older do not, or did not "do" facecreams, grooming, or any of that shit. It would have been seen as effeminate or at the very least vain. (Dare I use the word effeminate?, Is that PC? no idea.) Neither I nor any man I know does it or did it. I am 64.
When I was younger I was blessed with looking younger than my age and it was the party trick of a friend of mine to introduce me to people and get them to guess my age, they always thought me at least a couple of years younger than I was. Then when I was 23 a girlfriend pulled a hair out of my head. I asked her what on earth she was doing so she showed it to me. Grey. Since then I have lost most of my gloriously once auburn hair which went so well with my green eyes and what I have left is dead grey.
My second wife was 43 when I met her, I was 35. she looked much younger than her years and people were sure we were about the same age. Since then sadly she has had various health problems and this includes breast cancer for which reconstructive surgery was not appropriate. She is disabled for other reasons as well. She makes huge efforts with her looks, to the point that it almost gets on my wick as she doesn't need to, at least not for me, as I love her just the way she is. But I let her get on with it as she was a real looker when she was younger and for a very long time after and it does her good to look after herself, as she hates losing her looks. In spite of her health, she still looks about 10 years younger than she is, with clothes on. But without clothes there is no mistaking her age. I too have a battle now with my weight and it is true that anno domini is a real shit. But we have both agreed that looks are what they are, we cannot change them much but what is important is how we feel about one another and communicating with each other if something one does upsets the other.
I would suggest OP talks to her DP and really lets him know how she feels. If she has to do this she might actually consider how important looks are to her. If she cannot bring herself to do this but can talk to him about how he is not as much fun as he used to be, then I would say she is not as shallow as people on here have said. But if she gets right stuck in with the "do something about your looks" angle then I would be forced to think she is shallow.
If he makes an effort to be more fun and caring and you find him more atrractive then it should mean that the looks thing is not too important and once you have him onside you could then ease him towards doing something about the looks thing.
True love can get past the way we age, if it doesn't and looks matter more than how a man treats you, then jack it in and the best of luck to you.