Nevertolate,
Buy a 16-20 foot daysailer in which to learn. My experience after more than 60 years as a sailor is that people who learn to sail monohull dinghies can quickly learn to sail anything else and make the switch to big boats easily. That's not true the other way around.
Once you learn what makes a sailboat go, and the nuances of the standing and running rigging, there will be literally dozens of good 28-30 footers available in your budget range, many of them in mint condition.
You can learn to sail on a Sunfish or Laser, and they are fun boats. But I think the best way to start is on a small sloop (mainsail and jib), and since most guys your age aren't midgets, preferably on a boat you can sit in comfortably and that weighs more than you do.
I've owned a dozen sailboats from 12-32 feet in my life, both monohulls and multihulls, and I've helmed and crewed aboard other boats up to 60 feet. I spent a lot of years racing, but my wife never enjoyed sailing much (and hated being aboard in a race.)
Last summer one of her friends decided to take a beginner's sailing course at a yacht club, and she talked my wife into doing it with her. They sailed 420 dinghies, a very physical and uncomfortable little 13-footer normally raced by high school and college kids.
She enjoyed it, and what's more, it turns out she's a natural helmsperson. After that class ended I bought an 18-foot daysailer so she could keep sailing. It's fast and fun and much more comfortable than the 420, especially for women of a certain age, as the French say.
Because I travelled so much in my job I hadn't owned a cruising boat for some years, but I also found a 30-footer that I liked a lot and we bought that, too. Her first bigger boat experience was on that 30-footer, and once she figured out that you turn the wheel the opposite way that you would a tiller, she loved sailing it.
We are keeping the bigger boat on the Great Lakes and trailered the daysailer back to Florida, where it's great for puttering around the shallow bays on the southwest coast.
Before you buy a cruising boat, ask yourself what you want to do with it. Remember, most 30-foot sailboats average about 5-6 knots, so you aren't going to go very far if you're just out for the day. Will you mostly daysail or are you planning some extended trips?
You also have to think hard about how much will actually use the accommodations below. I have a friend who owns a beautiful 35-foot cruising boat that he has never spent a single night aboard. He races and daysails and ties it up at its home dock every night. About all he uses the galley for is making Bloody Marys in the marina in the evening.
And what are the sailing conditions where you live? If you have a lot of shallow water, you won't want a deep draft boat. If you mostly experience light air conditions, as in southwest Florida, you'll want a lighter boat with a lot of sail area. If you get nice trade winds, like the east coast of Florida, a heavier, deeper-draft boat might be better.
There's a lot to think about. That's why it won't hurt to spend a year or so learning to sail through a local yacht club or private program before committing to a boat you'll probably keep for some time.
Lots of luck,
Gobsmacked