His head, Not yet by time completely silver'd o'er, Bespoke him past the bounds of freakish youth, But strong for service still, and unimpair'd.
William Cowper
Time
A quote by William Cowper
From the source
The Task. Book ii. The Timepiece. Line 702.
Recorded in John Bartlett’s Familiar Quotations, ninth edition, 1905 printing.