Might not be of interest to many here, but remember Peru has a law that senior citizens, families with kids, special needs folks have legal priority in Peru... and that means LIM and other airports. So you can go to the front of the line, or separate line, for check in, security, immigration etc. No need to feel guilty, it is the law and we are all law abiding citizens jeje. Sure speeds things up when there are long lines.

(It also explains why you may see people being served ahead of you in a line).