No idea about snoring at certain age ranges, but I'm 42 and as far as anyone/everyone has ever told me, I snore when laying on my back. I hardly ever snore when sleeping on my side though. I think there's something to it actually, I mean gravity affects people when laying down too.
I've likely had sleep apnea from before that age (I'm in my mid 30s now) and I never snored. I seem to recall that there isn't actually strong correlation between snoring and sleep apnea, although I could absolutely be wrong.
More indicative would be nocturnal gasping, waking up frequently, morning headaches and excessive tiredness, and lots of movement at night.
EDIT: also, weight is not a reliable indicator that one has sleep apnea. When I was diagnosed, I was 5'11" (180 cm) and weighed 130 pounds (59 kg). I was a very skinny man. I've packed on a sick beer gut since then without a worsening of my symptoms. Some people just have a shitty throatus that refuses to stay open.
Yeah, little gasping breaths are a super clear symptom. I'd wake my partner up by thrashing, and afterwards she said I'd always be gasping and lurching around. Many people snore, not so many do the whole unconscious "oh fuck I can't breathe" thing.
I disagree. I think the modified statement: there are many people who snore who have good quality of life is true.
There are downsides to snoring, one when you're asleep and vulnerable you're making noise so predators can find you. Obviously that's not a problem nowadays, but it's not how we're designed to operate
Snoring, hypertension, obesity, diabetes, etc, all of these are signs of metabolic syndrome. The vast majority of people in the West have metabolic syndrome right now, and well it may not affect their day-to-day life now, it can significantly impact their quality of life later. Being metabolically healthy today, including not snoring, helps avoid a lot of the issues we associate with growing old