One of the sad things about the massive increase in popularity of engineered quartz countertops has been the massive increase in 20-something year olds getting silicosis and needing lung transplants.
Just to be clear about your source for other readers. It discusses the workers who produce these counter tops versus people merely having them in the home (what I originally inferred with your comment), it says the mean age of onset was 43 years old, and that 79% of the workers with silicosis did not use personal protective equipment.
I’m pretty certain the studies are lagging indicators with regards to the age of incidence; the jobs have seen a significant shift in the ages of employees as more of the work is now done by immigrant/second gen labor than in years prior. A family on my street in Palo Alto had three sons diagnosed with silicosis by 25.