Yes!
73 years old, is there hope for me?

I'm 70 and I was surprised the other day to find out that we don't get any younger. So there's no hope and we have to avoid relying on hope and just go all out to be what we want to be. Because last chance saloon.
Don't be hopeful .... be determined.

I am 36, bit younger, I would like to be highly rated one day, I have learning difficulties and such so its not easy. I often turn ratings off on some games, I enjoy chess and don't focus so much on my rating most the time.

It is hard to improve by playing a lot and just doing puzzles. Studying a good book or two aimed at your level would probably do more for your chess ina few weeks than everything you have done up to now.
A good place to start is learning some basic endgames. I'd recommend starting by studying "Chess Endings, Essential Knowledge" by Averbakh, and following that up with Yusupovs' "Build Up Your Chess 1: The Fundamentals"
Of course the most important thing at any level, but especially when you are starting from a low rating, is to reduce the number of blunders. With practice good players just know subconsciously (at least most of the time) if a move is a blunder, but to get to that level you have to spend some time consciously checking before making a move whether you are leaving something en prise, allowing a fork, a skewer a simple checkmate and so on. As you improve you'll notice more subtle errors.
Playing games at longer time limits gives you time to check carefully that you are not making elementary blunders. Blitz and Bullet do little for your chess ability. Rapid is a bit better, but there is nothing like a slow game, where you are not under time pressure, for improving your ability.

It is hard to improve by playing a lot and just doing puzzles. Studying a good book or two aimed at your level would probably do more for your chess ina few weeks than everything you have done up to now.
I completely agree.
Puzzles can be fun, and can help you get better at certain things, like spotting tactics ... but they won't help you learn how to actually play chess.
Quality books are far more instructive, and can introduce you to ideas (especially the fundamentals of positional play) that you would likely not learn through puzzles or playing alone.
Books can be a joy for a learning player (especially if you follow along, using a board and pieces), as they can fill your head with insights and revelations. "Oh!" you'll find yourself saying. "That makes a lot of sense! I never would've thought of that, before!"
I recommend searching for some gentle beginner books. As others have pointed out, these are far more likely to help you improve, and to increase your fascination with the game. Best of luck!
I believe in you!!!!