"How incessant and great are the ills with which a prolonged old age is replete"

[wotcha]

"How incessant and great are the ills with which a prolonged old age is replete"

What does this quote exactly mean?

[JMurray]

"How incessant and great are the ills with which a prolonged old age is replete"

I'll give you a little help and perhaps you can work the rest out yourself.
Note that it's not a question.
incessant = unceasing, continual
ills = problems, misfortunes
replete = filled up

not a teacher

[wotcha]

"How incessant and great are the ills with which a prolonged old age is replete"

I'll give you a little help and perhaps you can work the rest out yourself.
Note that it's not a question.
incessant = unceasing, continual
ills = problems, misfortunes
replete = filled up

not a teacher

Hmmmm

The problems which very old people has have are continual and great (?)


Sorry.

[emsr2d2]

Hmmmm

The health problems which very old people has have are continual and great (?)


Sorry.

Not a bad attempt at all. Note that I deleted one of your verbs above. I have also added a word. "Ills" generally specifically refers to health issues although it can be used to simply mean "problems". You hear the phrase "The ills of the world ..." meaning "All the problems facing the planet ..."