More rare today than long ago. There's a salutation from friends written below. What am I?

Answer: letter

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More valued than gold, more precious than silk. Pouring like wine and flowing like milk. A count’s nightly feast, an offering of war, a pact that is sealed forever more. What am I?
Most people love to use me. You make me glide through the air. Even your dog loves me. What am I?
My first can be found at the start of a letter. My second is the second of second. My third is the first letter. My fourth can be found by a fairway. My fifth is before the eye. My whole is a friend at the end. What am I?
My first half means container. Not a lot of people understand my language. What am I?
My first part compliments people. My second part makes things known. My third part hurts feelings. My fourth part holds a previous treasure. My fifth part is used when sharing fancy beverages. What am I?
My first part compliments people. My second part makes things known. My third part hurts feelings. My fourth part ma hold a previous treasure. My fifth part is used when sharing fancy beverages. What am I?
My first two letters say my name. My last letter asks a question. What I embrace I destroy. What am I?
My flavors ranges from strawberry to toe. What am I?
My life is measured in hours. I serve by being devoured. Thin, I am quick; Fat, I am slow. Wind is my foe. What am I?
My life is often a volume of grief, your help is needed to turn a new leaf. Stiff is my spine and my body is pale. But I'm always ready to tell a tale. What am I?
My might alone cannot be weighed My voice is where they gave my fame Cloaked in gray, I cannot be tamed Do not fret, for I do not stay What am I?
My mother is water and my brother the sky. I am grey when wet but white when dry. What am I?