First thing that comes to mind is that....these set of people made one of the biggest impact on one's life and the time they need us most should not be spent alone.
Like you've explained, some people work schedule might not allow them have their aged ones at home. For such people, I think the balance is taking their aged ones to nursing homes but paying frequent visit to them.
Whatever good the future holds,I will try my best to see that my parents do not lack attention, care and love.
Yes ooo... that period is very vital because they would be all alone while we the young ones are busy trying to build our lives. That loneliness can do a lot to affect them. We must pay more attention.