'Children' is usually बच्चे. 'लड़का' may be used to refer to male teenagers or even young adults.
This is off subject, but I'm wondering why I lost my streak before midnight? Does anybody know? I live in Texas, what is no later than time? Is it Greenwich Mean Time? I need to know.
In my experience, it's midnight in whatever time zone your device is in. I also live in Texas, and my devices are set to Central Time so it's midnight CDT or CST depending on the time of year. I used to live in Arizona, and the deadline was always midnight MST (no daylight savings time in AZ) Even when I travel, as long as my device stays set to my home time zone, the deadline is midnight home time. Hope this helps.