Hi, we got our marriage licence in Cavite and then got married in Talisay, Negros - it is fine, however if you are using a pastor rather than an official (mayor/judge) they may just check first as they may not have come across the situtation before - so let them know beforehand, they can check before you arrive and no problem
The marriage counselling and family planning seminar (seperate events in Cavite) need to be completed before your marriage licence can be issued (we got seen and signed off instantly for marriage counselling as we had been living together, but had to sit through the fp for about 3 hours with children and pregnant fiances also in atendance!! - nothing to do with age) - think it may be OK to do them within the 10 days - sorry can't remember