Welcome to Belly Belly (I am a "Lucy Jane" too by the way!)
I think the common figure for a womans age to start affecting her fertility is 35. So you have years to go yet! But certainly it varies from woman to woman, so you can't rely on that figure.
And fertility is also affected by so many things between a couple, that age isn't the only consideration: general health, stress, lifestyle, diet & environment, not to mention emotional "readiness" can also have an impact.
I guess the most useful thing for you & your fiance to do is to keep the lines of communication open about it all the time, so that either of you feel easy talking about it: this may make compromise on "when start trying" a little easier to negotiate!
Best of luck! There is is forum HERE on "Pre-Conception" which you'll most likely find useful too.........
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