I always knew I wanted children. DH and I both talked about how we wanted a large family during premarital counseling. After marriage though, he wasn't interested for several years. We will be having our first baby on our 5th wedding anniversary. We waited to: finish grad school at night, buy our second home that we could bring babies home to, save leave for maternity leave (I could only save 9 weeks though after 8 years of working), save money.
I really wanted to have children in my 20s, but life is expensive!