Grandchildren.
I have five, and they are amazing. Youngest is 9 months.
We have an old car goiong to the scrapyard in a couple of weeks, and today I sat in the passenger seat of it as my 13 yr old grandaughter drove it around one of our fields getting more and more confident as I encouraged her to stop, put it in reverse, and drive in the opposite direction.
From "this is too difficult" to "I want to be a rally driver" in a few dozen gear changes.
Memories like this are some of the luxuries of life. For her, for me, for her parents, and her siblings watching.