My grandchildren, now teenagers, occasionally come to stay, usually with their parents, but once in a while on their own.
In the past 4 or 5 months I have had my older grandson, now 17 come and stay for a few days, and last weekend, he and his sister had come to stay.
Yes, the food they want is different, yes old grandpa and grandma's normal routine gets changed. But, when they leave I'm "bluer than blue" . Suddenly the house seems full and brings back so many memories of when my children were growing up.
I hope my grandkids will always feel welcome here and will enjoy coming by, even later on, as they grow away from their own homes and sttike out on their own.