Not according to Encyclopedia Britannica....
dote /ˈdoʊt/ verb
dotes; doted; doting
Britannica Dictionary definition of DOTE
dote on/upon
[phrasal verb]
dote on/upon (someone or something)
: to give a lot of love or attention to (someone or something)
No mention of senility
yes dote is very archaic word ..even has some German roots too..
and this .....
The verb dote , meaning
to decay or rot, especially of wood, is in general dialect use in England, and, according to the English Dialect Dictionary, in Ireland and in the US. Hence doted and doty : decayed, mouldy, rotten. According to Kersey in 1702, a doting tree is one that is almost worn out with age. ( check your trees out for dote
)
I am Scottish by birth and lived there for 25 years before coming to Canada.
Never once heard that word used in reference to a senile person, It was always used in a loving way.
As I said in previous post we would, as youngsters make reference to older people..as 'dotty' ( and some young people)
or say in their dotage as we got older.
Just my tuppence worth