This article by an expert on aging explains why the elderly are more at risk if they catch Covid19. I haven't read such a clear account before.
Of course we all have choices based on our own attitudes to risk and what makes life worth living, but this piece interprets that blanket term "underlying health conditions".
The author writes:
".....vulnerability to COVID-19 is more complicated than just reduced immunity. Young children who also do not have fully functional immune systems, and are prone to illnesses such as influenza, are at very low risk of severe COVID-19. There must be something about ageing itself that spurs vulnerability to the disease.
Ageing not only involves reduced immunity, but also chronic inflammation, which occurs when parts of the immune system become overactive. Chronic inflammation is common in patients with underlying conditions such as obesity, hypertension and diabetes which also increase the risk of severe COVID-19
....For now, the data is clear. Over-70s run a much higher risk for severe COVID-19. As the virus is still spreading through communities, and given that we might experience a second wave or local flare-ups, the over-70s must continue to take the greatest care to minimise their exposure and risk.
Sticking to strict social distancing, limiting the number of contacts and avoiding busy places such as public transport and shops is essential."
theconversation.com/coronav...
This is a good, useful news website I think by decent journalists and contributors.