This missing number puzzle asks one tidy question: which whole number has disappeared from a list meant to contain 1 through 60? There is no secret equation to decode. Look at the supplied grid, follow the numbers in order, and find the gap.
Give yourself a moment before scrolling if you want the challenge unspoiled. You do not need a stopwatch, a calculator, or anyone telling you what your age is supposed to allow. This is a just-for-fun observation activity, not a test of intelligence or health.
The answer is confirmed both by the source explanation and by the visible sequence. We will show it clearly below, along with a way to verify it instead of simply accepting a reveal. The original age-related taunt has been removed from the displayed puzzle because it is not a meaningful rule.

The Rules of This Missing Number Puzzle
The numbers are arranged across five rows. Read each row from left to right, then move down to the beginning of the next row. The intended set is the whole numbers from 1 through 60, with one missing.
That statement matters. It tells you exactly what should be present. You are not being asked to guess a hidden formula from a few terms or invent a clever relationship between unrelated numbers. You are checking a list against a known sequence.
If you prefer to solve first, pause here. Move through the grid at a comfortable pace and notice whether each number is followed by the next one. A pencil can help you keep your place without turning the activity into a race.