First of many confessions

I’m 20 and currently dating a man 20 years older then me . I met him through work and it started out purely as a fwb thing, but we fell for each other and are now dating . He treats me so well and I’m completely head over heels for him ! I’ve met his mom and his friends and hung out with them and everything, but I’m starting to think I might love him and that scares the crap out of me . What happens in 20 more years when I’m 40 and he’s 60 ? Is it wrong of me to want to just find out when the time comes ?