Well, I'm in USA (Virginia), but question for you anyway: Are there many slow cubers at the competitions, or are they mostly under-20 second hotshots? Any really slow ones? And what about older cubers? You are over 40, but I am about to be over 80. I'm curious anyway!
Meanwhile, congrats to you and your boy.
Generally there aren't that many older cubers. But we're still welcomed, even if we're not that common. In Europe the average age tends to be much older than in the US. Here in the US the age tends to skew pretty young; the average cuber's age is probably 14 or 15 at most of the competitions I've been to lately, and that's even with me pulling the average way up by my being there.
And someone like yourself, being 80, will likely be a fascination to a lot of people there. If you happen to go to a competition where there's press, the reporter is very likely to notice you and want your story.

I know I love it when I see a competitor older than me at a competition!
As for slower cubers, generally they are mostly under-20 second hotshots. I average around 20 seconds, so I almost never make the second round for 3x3x3 - I'm too slow.

But there are always plenty of stragglers with slower times, so you won't feel alone! Look at this link from the "Rally in the Valley" in Middletown VA earlier this year:
https://www.worldcubeassociation.org/competitions/RallyInTheValley2018/results/all#e333_1
You'll see there were 6 people there with over 1 minute averages, and one with over a 2 minute average.
I live in Indiana, but my parents live in Virginia, so I have on occasion made it to a Virginia competition when it was convenient to my schedule. Perhaps we'll meet at a competition someday!