Both of you are not working for the same company anymore and if you had good rapport, why not? I like Coolwave35's approach. As for me, I hooked up with a coworker 2-3 years before we were coworkers. We weren't in the same team but we were in the same department. Heck I didn't even know his last name and we just recognized each other at the holiday party. He left the company back in 2020 and I caught up with him a few weeks ago as friends.