Age of location returned from LocationServices

I need to ensure the location I use is fresh:

Is there a way of finding out how old the location result returned by LocationServices.FusedLocationApi.getLastLocation is?

If not: if I register a location listener to the LocationServices.FusedLocationApi.requestLocationUpdates (with setNumUpdates(1) and setMaxWaitTime(0)) then will it update if the location has not changed from the one returned by LocationServices.FusedLocationApi.getLastLocation?

Yes, there is a very easy way. You can get the time of a Location fix by calling getTime() like this:

Location currentLocation = LocationServices.FusedLocationApi.getLastLocation(apiClient);
long locationAge = System.currentTimeMillis() - currentLocation.getTime();

if (locationAge <= 60 * 1000) { // not older than 60 seconds
    // do something with the location
}

The documentation recommends not to use System.currentTimeMillis() for time comparisons, but I never experienced any flaws with this method. However, you should consider reading the (short) documentation:

https://developer.android.com/reference/android/location/Location.html#getTime()