Do you know anyone who eats a lot, but looks really skinny?
as thin as a rake
Do you know anyone who can't see anything if they're not wearing glasses?
as blind as a bat
Do you know anyone who went through a lot of hardships, but never gave up?
as tough as old boots
Do you know anyone who always sleeps very well at night?
sleep like a log/a baby
Do you know anyone who drinks too much?
drinks like a fish
Do you know anyone who refuses to change their opinion even if they know they're wrong?
as stubborn as a mule
Do you know anyone who has very well-behaved children?
as good as gold
Do you know anyone who is in great physical shape?
as fit as a fiddle
Do you know anyone who can't hear very well?
as deaf as a post