You should be fine, as you are 15 and can likely walk fast if needed!
What's your final destination? Worst case scenario is UA puts you on a later flight. But if your destination has little service, your wait may be long!
Originally Posted by
WineCountryUA
At LAX, arriving on CRJ you will likely arrive at gate 71, it is roughly equal distanced from the UA gates.
LAX gates
Recommendation is to have a seat at the front of the CRJ, avoid gate checking anything and have a good idea of the layout of the LAX gates before arriving.
Actually, most CRJ's arrive at the 80 gates I thought. A bit more of a walk. But again, a young healthy person can get from the end of the 80's to the end of the 60's in 15 minutes!