I would think it’s more valuable when you’re younger due to the compounding effects of skills or knowledge gain
But when we are 20 years old, we can be certain we'll only be under 30 for a short time. With all that being under 30 entails ... of unreplaceable value. With good health and some luck, it will never be easier to travel, to meet a broad range of people ... to learn from and share with. To have the surplus energy to enjoy becoming good at something that might become a career (while realizing that advances in technology may make it obsolete!).
Life in a well-worn rut may be the only choice for some ... but those who stay free may find new paths.
How to reconcile these two ideas?