I say that as a young man myself. In an ancestral environment, a 18-30 year old man didn't have the decades of tracking experience, environmental knowledge, or tribal status required to reliably secure meat and protect a family. A man reached his providing peak in his late 30s to early 40s (data backs it up). The !Kung tribe for instance keep their men chaste until 30, same exact thing for Australian Aboriginals and the Zulu. All the great empires that rose kept young men away from sexual access until they reached older age. 

Here is some data: https://www.ncbi.nlm.nih.gov/pubmed/1206950

https://psmag.com/environment/17-to-1-reproductive-success/

https://pubmed.ncbi.nlm.nih.gov/18055408/

Young men having the chance to mate is a modern invention, therefore any concern over a “romantic male loneliness epidemic” is unnatural, this is important to mention since a lot of men accuse that behavior of the same thing when it’s the total opposite. Women are not at blame for their standards here, its just totally natural.