Age gap relationship

So me and my boyfriend are going to his grandparents house for Thanksgiving this year. This will be the first time I'm meeting any of his intermediate family. His grandparents are basically the ones who raised him so he looks up to them alot. I'm just super nervous because I don't think they know how big of an age Gap is between us. (I'm 19 and he's 32 so 12 years) but a little back story: I pretty much always knew I'd end up with an older guy just because my maturity level and mindset was so much older than anyone my age. It's always been that way growing up. I've dated other people but obviously since we were young none of them ever wanted anything serious but me on the other hand I do. I don't want to date just for the hell of it. I wanna date and make a future with whoever I'm with and in this case that's my current boyfriend. But I'm just so nervous his family will think I'm with him for all the wrong reasons. Most people think I'm in it just for money which is not the case at all. He has an average job anyways and isn't rich. I contribute as well with income but I know other people always are shocked with our age Gap and goah I couldn't be more nervous. Any advice if they put me on the spot? I just need some reinsurance that will hopefully make me less nervous lol! We are also TTC but don't plan on telling them or any family members right now until I'm actually pregnant. So I really do want to make a good impression and I'm just praying they don't think any less of me or don't approve because of my age.