Missing census records for this couple?

[Merry]

I am struggling with this couple and wondered if fresh eyes might help?

Charles Easton/Eason/Eaton was baptised in Chew Magna Somerset in 1826, parents James and Ann. The baptism entry states he was privately baptised in 1805, though there is no entry for that anywhere locally that I can see.

So, I started looking for Charles b 1805-ish and turned up these three entries:

1861 census Charles is aged 61 so a bit older than expected, married to Mary from Bath aged 50, Somerset living at Shepton Mallet, Somerset. Charles is an excavator.

Charles and Mary 1861

That is the only census I can find him/them on.

I would think this is his death reg:

Charles Easton
b abt 1803
Jan-Feb-Mar 1873
Wells
Somerset 5c 428

and his burial:

Charles Easton
abt 1803
4 Feb 1873
Horrington (East)

Everyone buried here seems to have come from an Asylum. I found his admission/discharge record for this yesterday, but Ancestry isn't letting me find it today. I do remember he had only been in the asylum a short time (months, maximum) when he died. There was no other helpful information on the admission/discharge record.

So, where is he in 1841, 1851 and 1871?

Some ancestry trees say this couple had a son, Mark Easton in about 1836, but they are wrong about that. This Mark was a different couple's son.