Reason: By the age of 22, the average heart has been extraordinarily busy. A typical resting heart rate is about 60–80 beats per minute, so let’s take a comfortable middle value of ~70 beats per minute.

70 beats per minute
≈ 4,200 beats per hour
≈ 100,800 beats per day
≈ 36.8 million beats per year

Multiply that by 22 years and you get roughly 800 million heartbeats.

Reason: This is a delightfully sneaky question, because while we can calculate some of the distances you’ve travelled, we can’t realistically add them all together — so the only truly correct answer is “We will never know.”

Here’s why:
The Earth orbits the Sun at about 30 km per second. Over 22 years, that alone adds up to roughly 21 billion kilometres.

Meanwhile, the entire Solar System is orbiting the centre of the Milky Way at around 828,000 km/h, carrying you vastly farther still.

And the galaxy itself is moving through space… which is where the maths starts to resemble guesswork scribbled on a napkin.

So while 21 billion kilometres sounds outrageously large (and it is), it still ignores several layers of cosmic motion. The real number is so big — and so dependent on reference points — that pinning it down precisely is basically impossible.

Reason: Who is Rose? Are you still the same person you were 22 years ago? Literally speaking, maybe not! Your body is far less permanent than it feels. Through metabolism — the constant intake of food, water, and air, and the equally constant shedding of waste — most of the atoms that make up “you” are gradually swapped out.

Scientists estimate that a large majority of your atoms are replaced roughly every 7–10 years, though it varies wildly by tissue:
- The atoms in the air you breathe may be gone within seconds.
- Much of the water in your body turns over in days or weeks.
- Skin renews itself about every month.
- Some cells in your bones can last years.
- A few specialised neurons may stay with you for most of your life.

Add that together over 22 years, and you’ve likely gone through the equivalent of two to three near-total atomic refreshes.

So… who is “you,” really? If every physical particle has been gradually exchanged, identity clearly isn’t just about raw material. It’s about patterns — your memories, personality, habits, relationships, and the continuously evolving structure of your brain.