Which of the stars is the oldest ? red giant ,main sequence, white dwarf? or are they all the same age

White dwarf

Red giant- a few thousand to a billion years old
Main sequence- ten billion years
White dwarf- hundred billion years

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you