I'm your age with long wavy hair. I spend a lot of time with it in a low ponytail but that is for comfort rather than style! The rest of the time;
Down and parted on the side or the centre, I rarely straighten it as I don't like to use heat on my hair.
Down with a hairband or Alice band.
Bun, either at the nape of my neck, on the back of my head or right up high. This can be a messy type bun or a smoother ballerina style bun. Hair can be parted or straight back.
Ponytail, variations as per buns. Use hair ties, barrettes, scarves, ribbons, or even a scrunchie for variety.
Plaits, french, or normal. I don't like two plaits but I do like just plaiting the top half or plating to the nape of my neck and leaving the tail loose. You can also plait a high pony tail. I like those sideways plaits but haven't managed to do them on myself.
Half up half down. This is my go to practical easy doesn't matter if hair needs a wash do. I use a clip rather than a bobble normally, and vary how much I clip back, sometimes just a small section to stop it getting in my face sometimes about two thirds.
Up dos, chignons, french pleats, victory rolls etc I would love to be better at these up dos but tend to stick with buns.