I really think that age is much less important than whether or not you're in a stable relationship with the means to provide for a family. As long as you're happy that your circumstances would work (for example, living together with a stable income) then I really think it's important that you find out where he actually stands - the never/someday distinction is so vital here.
Does he EVER want children? How many? How does he imagine his future? Raising a family with you? Growing old with you? What about marriage? Kids before or after marriage? Does he see himself as a dad in 5 years time? 10 years? If he's sure he'll want children eventually, you could work on establishing when - and make sure he knows how you feel too. With some open and honest discussion, hopefully you can come to a decision about when to try - even if it's a few years down the line. Maybe you have a list of things you'd both like to do before you have a baby - partying in Ibiza, climbing Mount Kilimanjaro or trekking in a rainforest or whatever? Put those things into your timeframe if you have to. Tick them off while you still can.
If he tells you he never wants kids, now is your time to decide if you need to call it a day. Don't assume he'll change his mind in a year or two. I have a friend who did that and regretted not ending things with her partner sooner. You have to do what's right for you. Sorry if I seem harsh, but life's too short to be with someone who doesn't share your vision of the future.
On an added note, I'm sure I'm not the only one who'll tell you that some men never feel 'ready' to start trying for a baby, so it can often be a matter of sitting them down and talking through things practically to get them to see where you're coming from. If that's the case with you two, then maybe it's as easy as "well if you'd like kids in 3-5 years time..." and working backwards from there?
Good luck xx
