We're in our 40's and YES we call someone to let them know we've arrived. It could be his folks, my folks, a sibling, a friend, but we do let people know when we've landed at any particular spot.
A majority of the call is simply a keeping in touch/wish you were here thing for those left behind. It's just a nice thing to do.
But there's also the "time marker" faction where if, God forbid, something were to happen to us (kidnap, earthquake, fire, disappearance, etc) there is a time-marker where someone would be able to say they last spoke to us at 3:00pm on Friday and we were at the Hilton on X Avenue in room XXXX and we mentioned that we might go to X venue for dinner or to a movie or the beach.
That "check in" call has many purposes, the least of which is any parent keeping tabs on us as they're in their 70's and we're in our 40's.