One thing to say. I have had a fairly decent time boxing from teenage years to 30’s.
Besides the obvious of experience and learning your sport/craft.
Teenage/early 20’s speed is much swifter, agile, recovery etc.
Sheer power, endurance (not fitness) endurance is a different beast. Becoming relaxed,
Comfortable, understanding the emotions, body adjusted and handling the contact/impact without being overcome with adrenaline etc, the get up, come down etc comes in probably late 20’s.
I’d assume a footballer is very similar. I have no reason to think Leinu in his late 20’s can’t be what leota is at 27/28?
Leota 5 years ago wasn’t much…