Hello Simon,
One needs to very careful indeed in stating what the minimum age for marriage was and what "full age" might have meant - it differed according to the year, and (if we are talking about the UK) the country.
For example, currently (my understanding is - though I suggest you may wish to check this out to ensure that I am right) the ages are:
*England & Wales - 16 with consent of parents, 18 otherwise
*Scotland - 16, no consent required
*Northern Ireland - 17 with consent, otherwise 18
and also (leaving the UK)
*Ireland - 18, otherwise court approval required
At the time of which you are speaking (1846), my understanding is that the minimum age for marriage in England & Wales was 14 for males and 12 for females but that parental consent was required for persons under 21. I believe that this also applied to all of Ireland. It did not apply to Scotland.
The various churches may also have had their own rules which might have differed from civil laws.
Regards,
JAP