As I'm looking around houses for sales, sometime, it's a challenge for me to know about the age of the houses. When asking agent, different agents give different answers...anyway I can check about it somewhere besides asking the residents there?

ask nearby resident bro

i think internet is the best way to know the age of properties... it might not be true, ask the owner yourself is better... if it's 1st hand property, in the S&P itself got written some dates...