Really? I "just knew" when I met this 18 year old girl. We married a week after her 21st birthday, in 1969. Trust your deepest instinct, as opposed to your homones, or in other words, "Marry guided by your mind, not your body'.
@MissKathleen If you're lucky.
Only commit to marriage or such like when you are sure that above all else, your partner is your trusted best friend