Welcome back! I returned at 43. The 230 and 250 are worlds apart. Let us start here. There are mx bikes, more motocross specific. Close ratio trans, stiffer suspension. Not so good for an older dude to get back out on. Next up would be a cross country racer, ie YZ250/450fx the new Honda rx and so on. Wider gearing 18” rear wheel more trail then track but still race oriented. For you...doable but not ideal. You could grow into a bike like this but it’ll be way above your current skill level. Lastly is a trail bike. These can range from the CRF 230 to a KLX450 and a pile of stuff in between. Two strokes and four strokes. Air cooled and liquid cooled. Much easier to enjoy, lots more fore giving than the racers. Now you will here an entire novel of opinions to come. That happens. Start some research. Look at important things like suspension adjustability, brakes(rear drums suck),aftermarket support(we all break stuff) and dealer support. A street legal bike is super handy. Just starting out again, I wouldn’t sink a pile in my first bike. Spend the cash on good gear. I’m on my fourth bike in 10 years. Chances are you’ll get hooked and before you know it your tossing your leg over a new Beta 300... ha ask me how I know.