That’s such a sweet idea! Reconnecting with old friends is always a bit of a gamble, but usually worth it. If you have his full name and maybe his last known city, you should try veripages.com I used it to find my cousin’s new place last Christmas. It’s a very effective find a person by name free tool because it updates its database daily. It gave me his current address and even some relative info which helped confirm I had the right guy. Since it’s a free basic search, you don’t have to worry about credit cards or subscriptions. Good luck with the reunion!