^^^ What they said.

I rode a ton and was really fit, then took almost a decade off and did Zero exercise beyond aggressive power-face-stuffing. Then i had some heart issues (Surprise!) and decided i was going to ride----partly for health, but mostly for happiness.

if you like to ride ... Ride.

I have a semi-racy bike and an "endurance" bike which is a lot more upright while still keeping me mostly under the wind (I have the aero of a cannonball, so .... )

I Love it. You probably will too.

At your age, you are young enough to ride like a kid and wise enough not to try to. I realized early I couldn't ride in the racer position, I couldn't keep up with the fast riders, and I couldn't climb .... pretty much at all. I also was old enough not to need to compete. now riding is a pure joy. I am slower than a slug on ice, but I am happy while I am riding.

Find whatever bike suits you. You can get stems for $15-$20, and spacers for $1 a piece----I have quite a collection. I have been adjusting my bikes from handlebars way up and real close, slowly downward and forward as my body adapted---and I can work my way back up as i continue to age. Find a comfortable set-up. Forget people who tell you to try to look like a pro racer.

As far as too late to start .... Only in that you missed out on a lot of fun. "Too old" for a road bike ... is when you get a recumbent and keep riding.