21 years in a home sounds like a lifetime too. I have been a nomad my whole life and the longest I have lived in a house is five or six years. I think it's because I rent.
I believe at this time of my life, connection with anything pure is all I am asking.
I am sure the re-wilded yard and her entire ecosystem will miss your presence too. Kind hands are unforgettable. Forget the neighbours, lol!