How difficult any instrument is to play depends on a lot of factors. Do you have any musical background at all? How much time do you have for learning and practice? Do you want to teach yourself or go through a teacher? Are you dedicated to your goal? etc etc.
I am currently teaching my self to play piano. I am 58 years old but have been playing music since I was 12. I am using the Piano For All lessons (I think the download was only about $45) that are a good starting point and very cheap. You can google it for availability. You can also find a lot of resources on Youtube. Bill Hinton (check him out on Youtube)also has a good basic book for about $15 that teaches you how to improvise more than just learning how to read music.
I am finding that it takes a little while to get both hands working together, mainly because it takes the brain a while to build the connections you need to do it.
I say go for it, have fun and don't take it all too seriously.
I bought a Yamaha YPG235 76 key keyboard for about $250 that gives a good piano sound. Something like that can get you into it at a reasonable cost just in case it doesn't work out and you then have a piano to deal with.
If you love music give it a try.The main thing with any instrument is practice, practice, practice. You will get there eventually.