Yes, angels are silent a lot, but they always listen what we feel, think and speak, we
don't have to say it out loud.
Our Guardian angels are with us a long long time for what I know one is always with you in different kind of lifetimes from the beginning till the end. This angel knows your soul really good and
will give your wear in a way that suits by who you are. Of course the other angel does that too but is more specific for this life time ( some are also a long time with us , I think it depends on what kind of choices were made before reincarnation )

Your angels always love you no matter what we do, this always is being forgotten by our one direction way of thinking or feeling lonely.
guardian angels are really for us helping us on earth, luckily more and more people notice them by feeling, sing or hearing them sometimes they even smell flowers in the house wich is also a sign they are near.
A lot is written about them but I think it is always different how we personally make contact with them. It doesn't have to be difficult we only make it difficult by ego thinking,
Meditating by visualizing you are on a beach, asking them to show themselves to you is already a good beginning.
Know that the can be found in a lot of things small or big. so try to look around you what you can find and you associate with your angels, they don't only know you well but you really know them just as well, wich is also something wich can be forgotten.
So all of the things that are written even this, is only to help and make you aware the rest is actually up to you how often you want to work with your angels and so on.  you can only take the tips you get to help yourself.
Know that even if you don't feel or see them they always are there nothing doesn't have to happen yet, mabey it is better for you it will come on the right timing.