I would suggest you both take IELTS and the primary applicant be the one with higher score. I would prefer that to be the younger one for the obvious reason, but you have good chances as you would qualify for, at least, two diplomas.my husband and i have completed a 3 year bachelors and 1 year masters degree.
we r 33 and 34, also i have 6 years expereince till jan 2014, my husband is still working and he has more than 10 years experience,we work in hr.
ielts we both do well.. only husband needs time from work to practice more, and i have all the time since i stay home with kids.
Good luck