Short answer: "Old soul" describes someone whose pace and habits are calm, planned and quiet. "Young at heart" describes someone who keeps their play, curiosity and spontaneity at any age. They are not opposites, and neither is a medical or psychological label. You can be both on the same day.
I'm Muhammad Husnain Zahid, I'm 22, and people tell me I act older than my age. On paper I fit the old soul picture: I plan my week, I work every day, and I check how long something will take before I say yes. But my own result on this quiz was in the 28 to 39 band, "Right on schedule." That is neither of the two labels in this article, which is a good reminder that real people don't fit them neatly.
What each phrase means
Old soul is an everyday phrase for a person who seems calmer, quieter or more serious than their age. They like routine, prefer small groups, and think about the future early. I went through the common signs in Signs You Are an Old Soul.
Young at heart is the other direction. It is a person who still plays, still gets excited about small things, and still says yes to a plan that makes no sense. A 70-year-old can be young at heart, and a 20-year-old can be the opposite.
Neither phrase comes from psychology. They describe a style, not an ability.
Side by side
| Everyday thing | Old soul | Young at heart |
|---|---|---|
| Free evening | A quiet night in, or one close friend | Whatever turns up, often last minute |
| Plans | Made ahead, with a backup | Made on the day, or not at all |
| Money | Compare, wait a day, then buy | If it looks fun, buy it |
| New trends | Arrive late, no worry | Tried early, for the fun of it |
| How others describe them | "So calm", "so serious" | "So energetic", "never grows up" |
This table is a plain summary of how people use the two phrases. It is not research.
Why it is not really about age
Studies on subjective age, meaning how old people say they feel, find that many adults feel younger than their birthday. In one well-known study, adults over forty felt around 20 percent younger than their actual age on average (Rubin and Berntsen, 2006). So "young at heart" is common, and it grows more common as people get older.
A later review of long-term studies found that people who feel younger than their age tended to have better health and lived longer (Westerhof and others, 2014). That is a link, not proof. It could be that healthier people feel younger, rather than the other way round. I'm mentioning it because it shows that how old you feel is something researchers take seriously, not because feeling young is a trick for living longer.
Can you be both?
Yes, and most people are. Think of someone who plans every expense in a spreadsheet and still takes an unplanned trip once a year. Or someone who is quiet at work and a different person with old friends. The two phrases describe where you lean, not who you are in every room.
Is one of them better?
No. Each has a cost. An old soul can get so settled that a week passes without a single unplanned moment. Someone who is young at heart can end up with money or deadlines that surprise them. The sensible move is to keep what works for you and leave a little room for the other side.
Where this quiz puts them
The quiz has five bands, and two of them have almost the same names as these phrases.
- 8 to 16: Forever young
- 17 to 27: Young at heart
- 28 to 39: Right on schedule
- 40 to 52: Old soul
- 53 to 75: Wise beyond your years
Every question runs from the most spontaneous answer to the most settled one, and your number is the average of the values you picked. So "young at heart" and "old soul" are just two stretches on the same line, with "Right on schedule" in the middle. The age guide explains each band, including what it does not say about you.
A word of care. A band named "Old soul" is still not a diagnosis, and a number that lands in "Young at heart" does not mean you are immature. The quiz has built-in biases, like assuming you already have a job and a household, which I listed in Is the Mental Age Test Fair?
When a label starts to hurt
Labels can turn into pressure. "You're so mature" can make a person feel they are not allowed to relax. "You never grow up" can make someone feel judged for enjoying themselves. If a label like that is weighing on you, talk to someone you trust or a professional. The help resources page lists free, confidential support.
If you are curious which way you lean, you can take the mental age test. It is free, anonymous and meant for fun and light self-reflection.
Sources and further reading
- Rubin, D. C. and Berntsen, D. (2006). People over forty feel 20% younger than their age: Subjective age across the lifespan. Psychonomic Bulletin & Review, 13, 776–780.
- Westerhof, G. J., Miche, M., Brothers, A. F., Barrett, A. E., Diehl, M., Montepare, J. M., Wahl, H.-W., and Wurm, S. (2014). The influence of subjective aging on health and longevity: A meta-analysis of longitudinal data. Psychology and Aging, 29(4), 793–802.
- This site's bands and scoring: the age guide.
Frequently asked questions
What is the difference between an old soul and young at heart?
An old soul has calm, planned, quiet habits for their age. Someone young at heart keeps their play, curiosity and spontaneity at any age. Both are informal phrases, not psychological terms.
Can you be an old soul and young at heart?
Yes. Most people lean one way in some parts of life and the other way in others, like planning every expense but still taking an unplanned trip.
Is being an old soul better than being young at heart?
Neither is better. An old soul can get too settled, and someone young at heart can be surprised by money or deadlines. Keeping a little of the other side usually helps.
Which mental age band is old soul and which is young at heart?
On this quiz, 17 to 27 is Young at heart and 40 to 52 is Old soul. 28 to 39 is Right on schedule, in the middle.
Does feeling young at heart mean better health?
Some long-term studies link feeling younger than your age with better health, but it is a link, not proof of cause. Healthier people may simply feel younger.