OP be very very careful in dating this man to stay youthful and energetic and heaven help you if you were to fall ill or be out of sorts from I don't know -menopause etc. Are you in tip top shape? Youthful looking? I mean obviously he's basically told you you'll get traded in for a younger model eventually. Right? (Oh and he's full of it -I am 57, became a mom at 42 -married my husband who was 42 - -and I have overall had much more energy than in my 30s because of positive changes in diet, exercise, hydration etc. I know many women like me.
Also didn't you catch him in his lie so what's with the apology for not "telling you sooner" - anyone's guess if he was ever going to tell you.