I would say no too. I feel concerned as he is an older man (5 years is a lot when you are only 16). Really, really feel for you as very delicate situation. You don't want to drive her off into his arms. I would suggest inviting him to your home for a meal, family parties, etc. etc. If your daughter thinks you like him, she will have nothing to rebel against.
-------------------- I've learnt that people will forget what you said, people will forget what you did, but people will never forget how you made them feel. Maya Angelou.