I am not really sure how reliable www.imei.info is cos my phone model shows that it is a D802 witk kitkat D80220c-ZAF-XX but when i check my IMEI on www.imei.info it shows that it is a D800 model but when i check the same imei at www.imeidata.net...
You can check LG by IMEI number
just go to http://imei24.com/imei_check/LG/
you will get any info about your LG,
including Device age
Production date 2015-07-22