To young?

Taylor
I'm 19 and my boyfriend is 20, what's to young to get engaged or move in together? My boyfriend owns 4 of his own companies, I work and have my own buisness as well. We have been together for a long time, with my mind set in ready for all of this, and my boyfriend used to be on board but after we broke up for 6 months and got back together his minds changed.