I’m older.....

Ok, the guy I am seeing is honestly I think the love of my life. I love him. We were very close friends for a few years I my Phd program, he ran a lab and he was always so good to me. My relationship with my children’s father has been awful and abusive and he refuses to move. I finally said well then I am done we are not together ( we hadn’t had sex in 6 months at that time). He is a weird passive person whom I wish I had not known but if not I wouldn’t have my children as I was approaching 40 and had my first at 40 and my second at 42. This new guy is there for me in every way and I don’t have it in my heart to handle telling him how much older than him I really am. The heartbreak will be too much. He thinks I’m like 7 years younger than I really am although I have never confirmed that or told him that! I never thought it would go anywhere and now here I am basically in love with him and I haven’t said that about anyone inside about 20 years. Help.