Hello heaven,
Though I am single, but i think i can understand what you r feeling and going through now. Age, to a ger esp, is a major obstruction in a relation. To make things worst, u hear nags from yr parent often, and there nothing much u can do cos its not yr fault at all.
Think the problem lies with yr hubby. To a ger, being in the late 20s is defintiely not young oredi but to a guy, he may not feel it. Actually frankly speaking i don't think u have much choice but to sit down and have a heart to heart talk with him, even if u 2 have to end up quarrelling. Stress to him, make him realise the importance of a custom wedding, just like what u told us in yr posts. Make him understand yr fear such as yr age, and insecure he have given u so far.
This may sound silly but worst to worst, CRY in front of him, or at the very least shed a few tears let him see :p. Think most guys' heart will soften upon a ger's tears. So he might just give in. Who knows rite?
Hope my advice come in handy in a way or another. All the best and take care. Do keep us updated!

Regards
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nOthiNg iS ImpOsSibLE In tHiS wOrLd
EvEn tHe wOrD ImPoSsiBLe SaYs "i'M pOsSiBLe"