Off the top of my head...
ICAO licences are perpetual
but individual nations may impose limits. Eg the UK CAA JAR ATPL requires renewing every 5 years. (listen to the cash register)
Probably will need to do a full type rating on the B737.
Definitely will need to do a medical.
The best I can do at the moment is from the UK CAA "LASORS".
Section G.
Scroll through to Section 5, Expired Licences.
Now, for the specifics about the type rating.
See
Section F F4.4
This is for a UK JAR ATPL. I suspect other JAA countries will have similar requirements.
For the JAA source,
JAR FCL-1 Within the document search for the words "expired" etc.