how to tell your parents that you're dating an older man

So I've been seeing this guy and he's nearly 12 years older than me. I really like him and my parents know that I've been dating so keep asking questions. I don't know how to tell them that this guy is much older than me or whether they will take it well. Any suggestions on how to bring it up so they won't think it's such a big deal? 
Thanks ladies ❤️❤️