Buying a house in Tianjin in 2009 does not belong to an old house. According to the information of the real estate network, all the houses in the property market that are over 20 years old are old houses, and the houses renovated in 2009 do not belong to old houses. Before the housing reform in China, the old residential areas were generally multi-storey houses, but after the housing reform in 2009, the real estate industry was mature and did not belong to the old houses. So buying a house in Tianjin in 2009 is not an old house.