Good Riddles

Question: The more of me you have, the longer your life.
The more of me you have, the less you have left.

What am I?

Question: With one you can't count past six,
nor can the gap between v and x be fixed.
You can read all of these lines,
but can't say what solves me.

What am I?

Question: What single line can you add to the following statement to make it true?

5+5+5=550

Question: I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter.

What am I?

Question: First think of a person who lives in disguise,
who deals in secrets and tells naught but lies.
Next tell me what is always the last thing to mend,
the middle of middle the end of the end?
And finally give me a sound often heard during the search of a hard-to-find word.
Now string them together and answer me this,
which creature would you be unwilling to kiss?