it would be nice if we hear of these marriages:
Alexandra of Luxembourg
Sebastian of Luxembourg, both 30
Joachim of Belgium, 30,
Maria Louisa of Belgium, 26
Pauline of Monaco, 28
Alexandra of Hanover / Monaco, 23 (maybe still too young)
and of the non reigning families: Elisabeth of Thurn and Taxis, Albert of T.and T. (both almost 40)
I think for non reigning RF, Rafael de Orleans Braganza of Brazil will marry soon. He is 36 y.o, the "heir" of Brazilian RF. The problem is he needs to marry royal bride, otherwise he'll be removed from the "line of succession".
As for the heirs of reigning royal families, I think Elisabeth of Belgium will be the first to marry.