"aged"[mesh] OR "aged, 80 and over"[mesh] OR "aging"[mesh:noexp] OR "frail elderly"[mesh]
'aged'/de or 'aged hospital patient'/de or 'frail elderly'/de or 'very elderly'/de
[mh "aged"] OR [mh "aged, 80 and over"] OR [mh "frail elderly"]
MH "aged" OR MH "aged, 80 and over" OR MH "centenarians" OR MH "frail elderly"
aged OR aging OR ageing OR advanced age OR advanced ages OR centenarian OR centenarians OR elderly OR elder OR elders OR geriatric OR nonagenarian OR nonagenarians OR octogenarian OR octogenarians OR old OR oldest OR older OR senior citizen OR senior citizens OR septagenarian OR septagenarians OR sexagenarian OR sexagenarians