Welcome to the forum. It is a pity it is under such sad circumstances.
There is no reason to be ashamed of your grief over the loss of these little creatures who have shared your life for such a long time. The loss is real and hurts to the core. It is the same when you lose anything you care for and love. You have my sympathies. I am older than you and I still feel the terrible longing to hold some of my little ones who have gone now and it still hurts very badly when something reminds me of them
I think that it is their age in all honesty. They are a very good age for robos and their little bodies will be becoming 'worn'now so they easily succomb. It sounds as if they crossed the bridge peacefully and in the comfort of their own beds which is the best way to go isn't it. I hope little Beth hangs around a little longer for you and when you feel the time is right that you find some crazy, youthful little furry friends who can stamp their own special uniqueness in your heart
Rest in peace Gimmel and Aleph
XX