The autor wrote a long humblebrag post. A 21 year old kid does not have the experience it takes to lead.
Equally possible, a 51 year old might have spent the previous 50 years in non-management roles and have no experience at all.
In project management and tech, experience and age are not related.
It's management skills that dictate how good someone is at their management job, not whether they've had sex or not.