I don't know what year my old bike is I don't know what year my old bike is.(like is it a 1970's etc). I think it may be a 1970's, or something like that due to research but I'm still not sure. I know it's a French old make, I believe Ravenna. But what year is this bike?
It's really easy to do but it's not very reliable either.

Since you got some good old 550 chrome wheels and it's french maybe they come from Rigida. Thing is, Rigida wheels where, at the time, stamped with their fabrication year which you will find inside a little losange.

Other way is to go for the hub. Some manufacturers like Normandy also dated their production by engraving the year (you got two numbers and have to look at the second one which is the two last digits of the year).

So assuming that the wheels are the original ones, that's your best bet to date your bike. 

From instinct I would say that it's a late 70's bike and from the tubing it could be italian more than french but here I can be wrong.