I had to hire the 12 yr old because the 16 yr old is too irresponsible!
When we are gone for long periods of time we have one of the kids friends come over and let the dog out. I was using my son's friends because I figured a 16 yr old boy could use a couple extra bucks and would be responsible. But the ding dong forgot. So I now hire his 12 yr old sister to do the job.