It sounds to me like you're burnt out. Happens to the best of us.
What worked for me was switching over to other forms of media for a bit. I read a fantasy series, started watching kdrama, stuff like that. I also switched genres for a little when I started to ease myself back into gaming. I also picked up new hobbies and spent more time out of the house.
People saying you're just getting old or you need to get out of gaming aren't necessarily right. Not entirely wrong, either. Try branching out a bit and see how you feel in a couple weeks.