Is it true it's best to have babies young ?

Kiara • Pursuing my dreams
Hello , 
​My boyfriend and I will be 25 in about 6 months and my baby fever is off the charts . I'm just feeling like it's time I can't explain it lol but we haven't done ALL we want to do . But what couple does ? Why put it off when even those who prepare for years still end up not being ready ? pregnancy better in 20's?