The stratospheric circulation is considered to be strengthened in response to the increase of atmospheric greenhouse gases, but supporting observational evidence has not been provided. To diagnose stratospheric transport, the mean age of air, the transit time of an air parcel from the troposphere to the stratosphere, has been estimated from measurements of trace gases, typically CO2 and SF6. Here we present and evaluate the age of air derived from halocarbon measurements of air samples collected at 15–35 km altitudes over Japan in 2020. The ages of air estimated from HFC-23, HFC-227ea and PFC-218 were almost constant at ~5 yr above ~25 km altitude, in general agreement to those derived from CO2 and SF6. We also examine the age of air estimated from multiple tracers for future use of upcoming data towards improving assessment of the long-term trend of the stratospheric circulation.