I saw that he was a gate keeper on that marriage certificate, but how can you tell he was still alive?
I can't, but it was the difference between the two certs that has made me consider it. I've been hunting for him in the Workhouses, but with no luck. I thought he might have been living with son George in 1861 census, but no ... George C (transcribed on A**y as Harriet rather than Haupt) hairdresser living by himself in Robin Hood Rd, Poplar, same address as marriage cert.
George Ludwig may well have returned to Germany, but I'm still thinking part of the problem is the writing/spelling/transcribing of Haupt as I can't find the two(?) younger boys either.
Sorry, George Ludwig's marriage entry at St Matthew, Bethnal Green, does not give occupations or fathers' names. George did sign the register himself, though his wife did not.
You might be new to this but you are asking lots of questions, the right questions, which means you'll get on fine.
As to where to find info - use whatever is available. Does your local library have free access to subscription sites ? (and remember this weekend is free on Find My Past on your own computer.)