would agree with the oil consumption part. but the age of the car doesn't matter. I have a civic 2005 with 162,000 kms on odo. I feed it with shell helix ultra 0w20 fully synthetic because 0w20 is mentioned in its owner's manual too. If i do notice a drop in the oil level, then I will consider shifting to 0w30 or 5w30.
One should consult the owner's manual first to see the compatible oil viscosities.