"how can I suddenly realize I'm a lesbian? Shouldn't I have known this?" This happens due to heteronormativity and compulsory heterosexuality. You grew up in a way and at a time when being straight was the "norm" so you never even considered your sexuality. Now something has "clicked" and made you realize who you truly are. If you want to connect with others going through this, join us in The Late Life Lesbian Community thelatelifelesbian.com/community