Almost all of the sexual marketplace experiences before 22-23 are based solely on circumstances.
Height is an important factor and dependent on your parents' genetics. Geographic constancy will help a lot if your parents keep you in the same geographic for the entirety of the K-12 years. The relationship between your parents also matters as males who deal with parents with some sort of dysfunctional dynamic are more prone to issues. I think height and geographic constancy are the 2 bigger factors, though a younger male will also be helped socially by keeping a normal range BMI. Being an overweight child was hurtful to social popularity in my formative years, but possibly less hurtful now with a larger percentage of the child population overweight.
For those that attend college, joining a fraternity will often make things easier. A mid-tier guy in a mid-tier fraternity is probably going to get a mid girlfriend from a mid-tier sorority. It is likely to be easier for him than a non-Greek Life affiliated mid-tier guy mainly doing stuff at off campus parties, on campus classes, or on campus social clubs.
Below are Greek Life stats. If a male attends a school with a less than 10% Greek Life participation rate, Greek Life won't impact campus life too much. If the Greek Life participation rate is 10-15%, then there are some impacts and he may be affected if he's not Greek Life affiliated. When the Greek Life participation rate is 16%+, then his social life is likely to be impacted at his university if he's not Greek Life affiliated.
https://www.collegetransitions.com/dataverse/greek-life
A lot of the guys who have good setups before 22-23 do peak earlier and can often get into the LTR that leads to marriage by then. Then might not be married at 24, but they might be in the relationship that gets then married at 26-28.
A lot of the peak early guys do end up as divorced males by their late 30s/early 40s. That's when it becomes evident their early advantage is gone and they are going to have to date like the guys who peaked later.