An older adult with health problems may suffer the effects of carbon monoxide more quickly than a younger person with no health problems.

VOA: special.2010.02.02

There's no adult supervision and you kind of run everything.

没有大人的监督，你可以做任何事情。

很好奇住宿生活 - SpeakingMax英语口语达人

In 1968 over one third of the total adult population of the UK had no natural teeth, and only a small number of people of pensionable age had any teeth at all.

BBC: Dentists warn over ageing teeth

The number of households where no adult aged 16 to 64 is in work has fallen for the second year in a row, official figures show.

BBC: Number of workless households falls again, says ONS

No adult with any level of assets should be without one, especially someone with millions no matter what their age.

FORBES: Amy Winehouse Didn't Have a Will After All, But Did Have Millions