I'm really enjoying my life becoming a cyclist

I just started riding again a bit over two years ago at 56 years of age after not having ridden since I was able to drive a car. Now the kids are gone, my knees won't take racquetball anymore, and after 5 years or so on the couch I needed something to do. So I picked up cycling by buying a Schwinn hybrid off Amazon which lasted me all of 3 months before I knew I wanted better.
Bought a Trek Gary Fisher Mendota 2 years ago. Awesome bike to learn on. Progressed to a Sirrus Limited which is also awesome and just last month got a Domane (yes, it's awesome) and my first clipless pedals and went for my first clipless ride yesterday and had my first clipless fall 20 miles in

Coming up hill to a stop sign and had to stop kind of unexpectedly due to a car coming from my left and, well, just fell over. It had to look glorious.
Two years ago, when my longest rides were around 20 miles, I went to just look and watch the Harpeth River Ride in Franklin, TN. Lance was there and I wanted to get a glimpse. I remember being amazed at this grandma coming in from a metric. How can she do that?! Last year I rode the 44 with my daughter only because I couldn't talk her into the metric. This year I'm signed up for the century. Hopefully, with luck and good weather, in a month I can scratch that one off my bucket list.
I will likely pose stupid questions from time to time as I continue to ride and learn. My question today is 'how many times am I likely to fall before I learn' or do folks continue to fall for a long time as they encounter new situations? I posed the question on FB to my only cycling buddy and his reply was 'the knees continue to take a beating'. Does this mean they continue for me for a while or it continues for everyone forever? Geez, I'm just wondering what I'm in for.
I must say on my first ride of a bit over 40 miles, it felt good to be attached to the bike, but I didn't notice any really noticeable increase in speed. I assume that will come with time. If it doesn't, screw this I'm going back to grippy platform pedals. Haha!