Hello,
Well it's a possibility and I'm happy to find connections that's for sure

However, my William Gage's birth has yet to be verified. This is what I know so far on him ...
William Gage m Mary Broderick 7 Jan 1833 Spitalfields. I haven't had a chance to go and look at the actual PR yet which may yield some extra info. But have the birth cert of William his son.
I have also found William and Mary on the 1861 and 1851 censuses. William's birthplace is noted as Bloomsbury.
The IGI entry for a William Gage b. 14 Feb 1805 Saint Marys, Marylebone fits perfectly with his age on the census howeve i have yet to verify this. However, the IGI does show what appears to be a sister, Charlotte Margaret b. 1799.
Be interested to know where you found Charlotte Margaret on a census when you rememeber! Have you looked at the actual registry entry for Henry and Charlotte's marriage? Might give some clue.
Regards
Jonathan