It’s Time to Rethink What We Call ‘Old Age’

I've been thinking a lot about aging lately. I'm turning 54 this year, so by all chronological measurements, I am middle-aged – the point when a person is, jokingly or not, considered “over the hill.” Yet that doesn't fit my self-perception: If you were to ask me how old I feel, I would say mid-30s. I consider my 50s to be the best decade of my life so far.