Welcome to LQ
Please do not post the same question more than 1 time in ANY forum.
This will save you some leg work in the end and ensure that all discussion takes place in 1 location.
Have you check the who man page? It looks like maybe a:
who -u (for newer versions)
is possibly what you are looking for? You could also grep it likely:
who | grep old
(Just tossin in some ideas since this post will lose the 0 replies status because of my initial reason for posting here).